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Text: At the outset it is necessary to examine § 5 (a) of the Clayton Act[8] and its relationship to § 5 (b). The former makes a final judgment or decree in any civil or criminal proceeding brought by or on behalf of the United States prima facie evidence in subsequent private suits "as to all matters respecting which said judgment or decree would be an estoppel as between the parties thereto." Several distinctions between these sections are apparent and suggest that they are not wholly interdependent. First, the words "final judgment or decree" are used in § 5 (a) and are of crucial significance in its application. However, § 5 (b) tolls the statute of limitations set out in § 4B from the time suit is instituted by the United States regardless of whether a final judgment or decree is ultimately entered. Its applicability in no way turns on the success of the Government in prosecuting its case. Moreover, under § 5 (a) the judgment or decree may be used only as to matters respecting which it would operate as an estoppel between the parties. No such limitation appears in the tolling provision. It applies to every private right of action based in whole or in part on "any matter" complained of in the government suit.

When we turn from the express language of these two statutory provisions to the congressional policies underlying them, it becomes even more apparent that the applicability of § 5 (a) to Federal Trade Commission actions should not control the question whether such proceedings toll the statute of limitations. We have discussed these policies at greater length below. At this juncture it is sufficient to say that in framing § 5 (a) Congress focused on the narrow issue of the use by private parties of judgments or decrees as prima facie evidence. This was recognized in Emich Motors Corp. v. General Motors Corp., 340 U. S. 558 (1951), where we stated that the purpose of § 5 (a) was "to minimize the burdens of litigation for injured private suitors by making available to them all matters previously established by the Government in antitrust actions" and to permit them "as large an advantage as the estoppel doctrine would afford had the Government brought suit." Id., at 568. As we shall show, however, its purpose in adopting § 5 (b) was not so limited, for it was not then dealing with the delicate area in which a judgment secured in an action between two parties may be used by a third. Whatever ambiguities may exist in the legislative history of these provisions as to other questions, it is plain that in § 5 (b) Congress meant to assist private litigants in utilizing any benefits they might cull from government antitrust actions. See S. Rep. No. 619, 84th Cong., 1st Sess., 6. The distinction was emphasized in Union Carbide & Carbon Corp. v. Nisley, 300 F. 2d 561 (1962), where the court, after noting the analysis of § 5 (a) set out in Emich Motors Corp., supra, stated that:

"The corollary purpose of the tolling provisions of the second paragraph of Section 5 [now § 5 (b)] is to vouchsafe the intended benefits of related government proceedings by suspending the running of the statute of limitations until the termination of the government proceedings, and allowing the private suitor one year thereafter in which to prepare and file his suit. The competency of a government judgment in a private suit is necessarily restricted to the requirements of due process. But the tolling of the statute during the pendency of the government litigation is not so limited." Id., at 569.
In our view, therefore, the two sections are not necessarily coextensive; they are governed by different considerations as well as congressional policy objectives. This makes § 5 (b) readily severable from § 5 (a). Even if we assumed arguendo that § 5 (a) is inapplicable to Commission proceedings_x0097_a question upon which we venture no opinion_x0097_that conclusion would be immaterial in our consideration of § 5 (b) and § 4B. Congress has expressed its belief that private antitrust litigation is one of the surest weapons for effective enforcement of the antitrust laws. This construction will lend considerable impetus to that policy.