In 1964 , Gregory became more involved in civil rights activities , activism against the Vietnam War , economic reform , and anti-drug issues . As a part of his activism , he went on several hunger strikes and campaigns in America and overseas . In the early 1970s , he was banned from Australia , where government officials feared he would " ... stir up demonstrations against the Vietnam war . " In 1964 , Gregory played a role in the search for three missing civil rights workers , James Chaney , Andrew Goodman , and Michael Schwerner , who vanished in Philadelphia , Mississippi . After Gregory and members of CORE met with Neshoba County Sheriff Lawrence A. Rainey , Gregory became convinced that the Sheriff 's office was complicit . With cash provided by Hugh Hefner , Gregory announced a $ 25,000 reward for information . The FBI , which had been criticized for inaction , eventually followed suit with its own reward , and the rewards worked . The bodies of the three men were found by the FBI 44 days after they disappeared
missing civil rights workers
Murders of Chaney, Goodman, and Schwerner
Dick Gregory