Frank Sinatra was a big activist in the civil rights movement, refusing to stay at hotels that didn't allow "Blacks". Even using his mafia ties to help get labor unions behind JFK because he knew they shared the same opinions on equal rights.
A Memphis jury’s UNANIMOUS verdict on December 8, 1999 RULED that Dr. Martin Luther King Jr. was assassinated by a conspiracy that included agencies of his own government. Almost 32 years after King’s murder at the Lorraine Motel in Memphis on April 4, 1968, a court extended the circle of responsibility for the assassination beyond the late scapegoat James Earl Ray to the United States government.
Martin Luther King assassinated, (prior to this his impact has begun to weaken) King's work before his death was to prove the catalyst for the Civil Rights legislation that followed, however just because laws were being put into place didn't mean that attitudes were going to change with them. King's legacy continued after his death.