Walter Bernstein (born August 20, 1919) is an American screenwriter and movie producer. He was blacklisted by the Hollywood movie studios in the 1950s. He was born in New York City. His first major work was screenwriting Sidney Lumet's "That Kind of Woman". He is known for his writing works "Paris Blues" (1961), "Fail-Safe" (1964), "The Magnificent Seven" (1960) and "The Train" (1964).