Robert Francis "Bobby" Kennedy (November 20, 1925 – June 6, 1968), commonly known by his initials RFK, was an American politician from Massachusetts. He was the brother of President John F. Kennedy. He served as a United States Senator from New York from January 1965 until his assassination in June 1968. He was previously the 64th U.S. Attorney General from January 1961 to September 1964, serving under his older brother President John F. Kennedy and his successor, Lyndon B. Johnson. Kennedy was a member of the Democratic Party and is seen as an icon of modern American liberalism.