Robert Francis "Bobby" Kennedy (November 20, 1925 – June 6, 1968), also called RFK, was one of two younger brothers of US President John F. Kennedy and served as United States Attorney General from 1961 to 1964 and a US Senator from New York from 1965 until his assassination in 1968. He was one of President Kennedy's most trusted advisors and worked closely with the president during the Cuban Missile Crisis. His contribution to the African-American Civil Rights Movement is sometimes considered his greatest legacy..