Jack Rubenstein was born on 5 April 1905 in New York City, New York, USA. He was married to Ruth Tarnofsky. He died on 5 July 1989 in Margate, Florida, USA.
Fought in the Spanish Civil War. A picket captain in the Passaic strike, he was arrested over 30 times for his activities. He later broke from the Communist Party and became vice president of the New York State A.F.L.-C.I.O.