Document:

<PAGE>   1

                                                                  EXHIBIT (4)(a)

                  AMENDMENT, dated as of June 18, 2001 (this "Amendment"), to
the Shareholder Protection Rights Agreement, dated as of December 19, 2000 (the
"Rights Agreement"), between First Union Corporation (the "Company") and First
Union National Bank (the "Rights Agent").

                                   WITNESSETH:

                  WHEREAS, the Company and the Rights Agent have heretofore
entered into the Rights Agreement; and

                  WHEREAS, the Company and the Rights Agent desire to amend the
Rights Agreement in consideration of the merger with Wachovia Corporation
("Wachovia"), as set forth in that certain Agreement and Plan of Merger, dated
as of April 15, 2001, between the Company and Wachovia, and certain related
transactions;

                  NOW, THEREFORE, in consideration of the premises and the
respective agreements set forth herein, the parties hereby agree as follows:

                  (1) Pursuant to Section 5.4 of the Rights Agreement, Section
1.1 of the Rights Agreement is amended to include the following at the end of
the definition of "Acquiring Person":

                 "In addition, Wachovia Corporation, a North Carolina
                 corporation, or any of its Subsidiaries (together, "Wachovia")
                 will not be an Acquiring Person as long as the Agreement and
                 Plan of Merger, dated as of April 15, 2001 and amended and
                 restated, between the Company and Wachovia (as may be further
                 amended and restated, amended or modified from time to time,
                 the "Merger Agreement") has not been terminated; provided that,
                 if the Merger Agreement has been terminated, the Board of
                 Directors of the Company may determine a reasonable period of
                 time after such termination during which Wachovia will not be
                 an Acquiring Person so that Wachovia may orderly dispose of any
                 shares of Common Stock Beneficially Owned by it."

                  (2) This Amendment may be executed in any number of
counterparts and each of such counterpart shall for all purposes be deemed to be
an original, and all such counterparts shall together constitute but one and the
same instrument.

                  (3) Except as set forth in this Amendment, the Rights
Agreement shall remain in full force and effect without amendment, modification
or waiver.

                  (4) Capitalized terms used and not otherwise defined in this
Amendment shall have the meanings ascribed to such terms in the Rights
Agreement.

                  (5) THIS AMENDMENT SHALL BE DEEMED TO BE A CONTRACT MADE UNDER
THE LAWS OF THE STATE OF NORTH CAROLINA AND FOR ALL PURPOSES SHALL BE GOVERNED
BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF SUCH STATE APPLICABLE TO
CONTRACTS TO BE MADE AND PERFORMED ENTIRELY WITHIN SUCH STATE.

<PAGE>   2

                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be duly executed as of the day and year first above written.

                                             FIRST UNION CORPORATION

                                             By:/s/ Mark C. Treanor
                                                --------------------------------
                                                Name: Mark C. Treanor
                                                Title: Executive Vice President

                                             FIRST UNION NATIONAL BANK,
                                                as Rights Agent

                                             By: /s/ Sherrie Garrett
                                                -----------------------------
                                                Name: Sherrie Garrett
                                                Title:  Assistant Vice President<PAGE>   1

                            AMENDMENT AGREEMENT NO 2.
                                       TO
                                CREDIT AGREEMENT

         THIS AMENDMENT AGREEMENT is made and entered into as of this 22nd day
of June, 2001, by and among THE WACKENHUT CORPORATION, a Florida corporation
(herein called the "Borrower"), BANK OF AMERICA, N.A. (the "Agent"), as Agent
for the lenders (the "Lenders") party to the Credit Agreement dated November 13,
2000 among such Lenders, Borrower and the Agent, as amended by Amendment
Agreement No. 1 dated December 12, 2000 (the "Agreement") and the Lenders whose
names are subscribed hereto.

                              W I T N E S S E T H:
                              -------------------

         WHEREAS, the Borrower, the Agent and the Lenders have entered into the
Agreement pursuant to which the Lenders have agreed to make revolving loans to
the Borrower in the aggregate principal amount of up to $112,500,000 as
evidenced by the Notes (as defined in the Agreement) and to issue Letters of
Credit for the benefit of the Borrower; and

         WHEREAS, as a condition to the making of the loans pursuant to the
Agreement the Lenders have required that all Wholly-owned Subsidiaries of the
Borrower, other than Titania, guarantee payment of all Obligations of the
Borrower arising under the Agreement; and

         WHEREAS, the Borrower has requested that the Agreement be further
amended in the manner set forth herein;

         NOW, THEREFORE, the Borrower, the Agent and the Lenders do hereby agree
as follows:

         1. DEFINITIONS. The term "Agreement" as used herein and in the Loan
Documents (as defined in the Agreement) shall mean the Agreement as hereinafter
amended and modified. Unless the context otherwise requires, all terms used
herein without definition shall have the definition provided therefor in the
Agreement.

         2. AMENDMENT. Subject to the conditions set forth herein, the Agreement
is hereby amended, effective as of the date hereof, as follows:

                  (a) The definition of "Chile" in SECTION 1.1 is hereby amended
         in its entirety so that as amended it shall read as follows:

                           "'Chile' means, collectively, Wackenhut Chile S.A.,
                  Wackenhut Safety S.A. and Wackenhut Mantenimiento Integral
                  S.A., each a SOCIEDAD ANONIMA  organized under the laws of the
                  Republic of Chile."

                  (b) The definition of "Restricted Investment" in SECTION 1.1
         is hereby amended by deleting the word "and" at the end of clause (g);
         (ii) relettering clause (h) as clause (i); and (iii) inserting a new
         clause (h) reading as follows:
<PAGE>   2

                           "(h) Investments securing Indebtedness of Chile in an
                  amount not to exceed $20,000,000; and"

                  (c) SECTION 9.4 is hereby amended by (i) deleting the word
         "and" at the end of clause (h); (ii) deleting the period at the end of
         clause (i) and inserting in lieu thereof a semi-colon; and (iii) adding
         new clauses (j) and (k) thereto reading as follows:

                           "(j) a Lien on a $20,000,000 deposit account of the
                  Borrower securing a loan to Chile which loan shall be deemed a
                  loan or advance made for the benefit of Chile pursuant to
                  SECTION 9.13; and

                           (k) Liens on the assets or stock of Chile, its
                  Subsidiaries or affiliates securing a loan to Chile, its
                  Subsidiaries or affiliates which loan shall be deemed a loan
                  or advance made for the benefit of Chile pursuant to SECTION
                  9.13."

                  (d) SECTION 9.9 is hereby amended by (i) deleting the word
         "and" at the end of clause (a) and inserting in lieu thereof a comma;
         (ii) deleting the period at the end thereof and inserting in lieu
         thereof the word "and"; and (iii) inserting a new clause (c) thereto
         reading as follows:

                           "(c) Guaranties of Rate Hedging Obligations to which
                  Chile is a party in an aggregate notional amount not exceeding
                  $20,000,000, which such Rate Hedging Obligations provide
                  exchange rate and interest rate protection with respect to the
                  Indebtedness referred to in SECTION 9.4(j)."

         3. SUBSIDIARY CONSENTS. Each Subsidiary of the Borrower that has
delivered a Guaranty to the Agent has joined in the execution of this Amendment
Agreement for the purpose of (i) agreeing to the amendment to the Agreement and
(ii) confirming its guarantee of payment of all the Obligations.

         4. REPRESENTATIONS AND WARRANTIES. The Borrower hereby represents and
warrants that:

                  (a) The representations and warranties made by Borrower in
         Article VII of the Agreement are true on and as of the date hereof;

                  (b) There has been no material adverse change in the
         condition, financial or otherwise, of the Borrower and its Subsidiaries
         since the date of the most recent financial reports of the Borrower
         received by each Lender under SECTION 7.6 thereof, other than changes
         in the ordinary course of business, none of which has been a material
         adverse change;

                  (c) The business and properties of the Borrower and its
         Subsidiaries are not and have not been adversely affected in any
         substantial way as the result of any fire, explosion, earthquake,
         accident, strike, lockout, combination of workers, flood, embargo,

                                        2
<PAGE>   3

         riot, activities of armed forces, war or acts of God or the public
         enemy, or cancellation or loss of any major contracts; and

                  (d) No event has occurred and no condition exists which, upon
         the consummation of the transaction contemplated hereby, constitutes a
         Default or an Event of Default on the part of the Borrower under the
         Agreement, the Notes or any other Loan Document either immediately or
         with the lapse of time or the giving of notice, or both.

         5. CONDITIONS. This Amendment Agreement shall become effective upon the
Borrower delivering to the Agent seven (7) counterparts of this Amendment
Agreement duly executed by the Agent, the Lenders, and the Borrower and
consented to by each of the Guarantors.

         6. ENTIRE AGREEMENT. This Amendment Agreement sets forth the entire
understanding and agreement of the parties hereto in relation to the subject
matter hereof and supersedes any prior negotiations and agreements among the
parties relative to such subject matter. No promise, conditions, representation
or warranty, express or implied, not herein set forth shall bind any party
hereto, and no one of them has relied on any such promise, condition,
representation or warranty. Each of the parties hereto acknowledges that, except
as in this Amendment Agreement otherwise expressly stated, no representations,
warranties or commitments, express or implied, have been made by any other party
to the other. None of the terms or conditions of this Amendment Agreement may be
changed, modified, waived or canceled orally or otherwise, except by writing,
signed by all the parties hereto, specifying such change, modification, waiver
or cancellation of such terms or conditions, or of any proceeding or succeeding
breach thereof.

         7. FULL FORCE AND EFFECT OF AGREEMENT. Except as hereby specifically
amended, modified or supplemented, the Agreement and all of the other Loan
Documents are hereby confirmed and ratified in all respects and shall remain in
full force and effect according to their respective terms.

                  [Remainder of page intentionally left blank.]

                                       3
<PAGE>   4

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment
Agreement to be duly executed by their duly authorized officers, all as of the
day and year first above written.

                                       BORROWER:

                                       THE WACKENHUT CORPORATION

                                       By:______________________________________
                                       Name:____________________________________
                                       Title:___________________________________

                                       4
<PAGE>   5

                                            GUARANTORS:

                                            TITANIA ADVERTISING, INCORPORATED
                                            TWC/FL/01, INC.
                                            TWC/FL/02, INC.
                                            WACKENHUT INTERNATIONAL,
                                              INCORPORATED
                                            WACKENHUT SERVICES, INCORPORATED
                                            WACKENHUT AIRLINE SERVICES, INC.
                                            AMERICAN GUARD & ALERT, INCORPORATED

                                            By:_________________________________
                                            Name:_______________________________
                                            Title:______________________________

                                       5
<PAGE>   6

                                      GUARANTORS:

                                      WACKENHUT EDUCATIONAL SERVICES, INC.
                                      WACKENHUT MONITORING SYSTEMS, INC.
                                      DIVERSIFIED CORRECTIONAL SERVICES,
                                         INCORPORATED
                                      WACKENHUT.COM ONLINE STORE, INC.
                                      SAVE-A-FRIEND, INC.
                                      WACKENHUT FINANCIAL, INC.
                                      TUHNEKCAW, INC.
                                      TITANIA INSURANCE COMPANY OF AMERICA, INC.

                                      By:_______________________________________
                                      Name:_____________________________________
                                      Title:____________________________________

                                       6
<PAGE>   7

                                    GUARANTORS:

                                    WACKENHUT RESOURCES, INCORPORATED
                                    WRI EMPLOYERS INSURANCE, INC.
                                    KING STAFFING, INC.
                                    KING TEMPORARY STAFFING, INC.
                                    KING BENEFITS, INC.
                                    KING EMPLOYEE SERVICES, INC.
                                    WORKFORCE ALTERNATIVE, INC.
                                    OASIS OUTSOURCING, INC.
                                    OASIS OUTSOURCING II, INC.
                                    OASIS OUTSOURCING III, INC.
                                    OASIS OUTSOURCING IV, INC.
                                    OASIS OUTSOURCING BENEFITS, INC.

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

                                    WRI STAFFING, INC.
                                    WRI II, INC.

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

                                    PROFESSIONAL EMPLOYEE MANAGEMENT, INC.
                                    PROFESSIONAL EMPLOYEE MANAGEMENT II,  INC.
                                    PROFESSIONAL EMPLOYEE MANAGEMENT III,  INC.
                                    PROFESSIONAL EMPLOYEE MANAGEMENT IV, INC.
                                    PROFESSIONAL EMPLOYEE MANAGEMENT
                                       BENEFITS, INC.
                                    PROFESSIONAL EMPLOYEE MANAGEMENT
                                       SERVICES, INC.

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

                                      7
<PAGE>   8

                                    GUARANTORS:

                                    WACKENHUT SERVICES, LLC

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

                                       8
<PAGE>   9

                                    GUARANTORS:

                                    WACKENHUT OF NEVADA, INC.

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

                                       9
<PAGE>   10

                                            BANK OF AMERICA, N.A.,
                                            as Agent for the Lenders

                                            By:________________________________
                                            Name: John E. Williams
                                            Title: Managing Director

                                            BANK OF AMERICA, N.A.

                                            By: ________________________________
                                                Name: John E. Williams
                                                Title: Managing Director

                                       10
<PAGE>   11

                                            SCOTIABANC INC.

                                            By:_________________________________
                                            Name:_______________________________
                                            Title:______________________________

                                       11
<PAGE>   12

                                            FIRST UNION NATIONAL BANK

                                            By:_________________________________
                                            Name:_______________________________
                                            Title:______________________________

                                       12
<PAGE>   13

                                            SUNTRUST BANK

                                            By:_________________________________
                                            Name:_______________________________
                                            Title:______________________________

                                       13
<PAGE>   14

                                            DRESDNER BANK LATEINAMERIKA AG,
                                            MIAMI AGENCY

                                            By:_________________________________
                                            Name:_______________________________
                                            Title:______________________________

                                            By:_________________________________
                                            Name:_______________________________
                                            Title:______________________________

                                       14
<PAGE>   15

                                            BANCO SANTANDER PR

                                            By:_________________________________
                                            Name:_______________________________
                                            Title:______________________________

                                       15

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00028-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00028-of-00352.parquet"}]]