Question: Who conducted the investigation into the responsibility of Lee Harvey Oswald for the assassination of JFK
About the article "Assassination of John F. Kennedy", section "Criticism of FBI".

Candidate passages:
The story of Jack Ruby and Lee Harvey Oswald and their involvement in the JFK assassination. 
The FBI's murder investigation was reviewed by the House Select Committee on Assassinations in 1979.
The congressional Committee concluded:
 The Federal Bureau of Investigation adequately investigated Lee Harvey Oswald prior to the assassination and properly evaluated the evidence it possessed to assess his potential to endanger the public safety in a national emergency.
 The Federal Bureau of Investigation conducted a thorough and professional investigation into the responsibility of Lee Harvey Oswald for the assassination.
 The Federal Bureau of Investigation failed to investigate adequately the possibility of a conspiracy to assassinate the President.
 The Federal Bureau of Investigation was deficient in its sharing of information with other agencies and departments.
  (with F. Peter Model) "JFK : The Case For Conspiracy", Manor Books, 1977.
ISBN 978-0532191070  (with Harrison Edward Livingstone) "High Treason: The Assassination of J.F.K.
and the Case for Conspiracy", Berkley Books, 1993.
ISBN 978-0425123447  "The Killing of a President: Complete Photographic Record of the JFK Assassination", Bloomsbury Publishing, 1993.
ISBN 978-0747516217  "The Search for Lee Harvey Oswald: The Comprehensive Photographic Record", Viking/Allen Lane 1995.
ISBN 978-0670858675  
As New Orleans D.A., Garrison began an investigation into the assassination of President Kennedy in late 1966, after receiving several tips from Jack Martin that a man named David Ferrie may have been involved in the assassination.
The end result of Garrison's investigation was the arrest and trial of New Orleans businessman Clay Shaw in 1969, with Shaw being unanimously acquitted less than one hour after the case went to the jury.
Garrison was able to subpoena the Zapruder film from "Life" magazine and show it to the public for the first time.
Until the trial, the film had rarely been seen, and bootleg copies made by assassination investigators working with Garrison led to the film's wider distribution.
Garrison's key witness against Clay Shaw was Perry Russo, a 25-year-old insurance salesman from Baton Rouge, Louisiana.
At the trial, Russo testified that he had attended a party at anti-Castro activist David Ferrie's apartment.
At the party, Russo said that Lee Harvey Oswald (who Russo said was introduced to him as "Leon Oswald"), David Ferrie, and "Clem Bertrand" (who Russo identified in the courtroom as Clay Shaw) had discussed killing President Kennedy.
The conversation included plans for the "triangulation of crossfire" and alibis for the participants.
Russo’s version of events has been questioned by some historians and researchers, such as Patricia Lambert, once it became known that part of his testimony was induced by hypnotism, and by the drug sodium pentothal (sometimes called "truth serum").
An early version of Russo's testimony (as told in Assistant D.A.
Andrew Sciambra's memo, before Russo was subjected to sodium pentothal and hypnosis) fails to mention an "assassination party" and says that Russo met Clay Shaw on two occasions, neither of which occurred at the party.
However, in his book "On the Trail of the Assassins", Garrison says that Russo had already discussed the party at Ferrie's apartment before any "truth serum" was admitted.
Moreover, in several public interviews, such as one shown in the video "The JFK Assassination: The Jim Garrison Tapes", Russo reiterates the same account of a party at Ferrie's apartment that he gave at the trial.
Jim Garrison defended his conduct regarding witness testimony, stating: Before we introduced the testimony of our witnesses, we made them undergo independent verifying tests, including polygraph examination, truth serum and hypnosis.
We thought this would be hailed as an unprecedented step in jurisprudence; instead, the press turned around and hinted that we had drugged our witnesses or given them posthypnotic suggestions to testify falsely.US talk radio host David Mendelsohn conducted a comprehensive interview with Jim Garrison which was broadcast in 1988 by KPFA in Berkley California.
Alongside Garrison the voices of Lee Harvey Oswald, JFK filmmaker Oliver Stone.
Garrison explains that cover stories were circulated in an attempt to blame the killing on the Cubans and the Mafia but he blames the conspiracy to kill the president firmly on the CIA who wanted to continue the Cold War. 
Robert J. Groden (born November 22, 1945) is an American author who has written extensively about conspiracy theories regarding the assassination of U.S. President John F. Kennedy.
His books include "The Killing of a President: The Complete Photographic Record of the JFK Assassination, the Conspiracy, and the Cover-up"; "The Search for Lee Harvey Oswald: A Comprehensive Photographic Record"; and "JFK: The Case for Conspiracy" (shorter version than his 1975 co-authored book).
Groden is a photo-optics technician who served as a photographic consultant for the House Select Committee on Assassinations.
A harsh critic of the Warren Commission, he also testified at the 1975 United States President's Commission on CIA activities within the United States (sometimes referred to as the "Rockefeller Commission").