The Warren Commission findings have been disputed,but mainly by conspiracy theorists who rely on speculation and hearsay.
In the nearly 60 yrs since the event,no hard evidence has surfaced which would link the Mob,in any way to the assassination.

Three other U.S. government investigations have agreed with the Warren Commission's conclusion.the panel headed by Ramsey Clark, the 1975 Rockefeller Commission, and the 1978-79 House Select Committee on Assassinations (HSCA), which reexamined the evidence with the help of the largest forensics panel. The HSCA involved Congressional hearings and ultimately concluded that Oswald assassinated Kennedy.. The HSCA concluded that Oswald fired shots number one, two, and four, and that an unknown assassin fired shot number three (but missed) from near the corner of a picket fence..

However, this conclusion has also been criticized, especially for its reliance upon disputed acoustic evidence. The HSCA Final Report in 1979 did agree with the Warren Report's conclusion in 1964 that two bullets caused all of President Kennedy's and Governor Connally's injuries, and that both bullets were fired by Oswald.

In the above listed investigations,a total of 19 Medical Examiners/Coroners testified. All agreed with the conclusion that all of the shots that struck JFK hit him in the back of the head. This even includes noted skeptic and Media whore Dr. Cyril Wecht, the unofficial leader of the tinfoil hat conspiracy crowd.