LaRouche movement Jack became involved with the LaRouche movement, acting as a consultant to the 1980 presidential campaign of Lyndon LaRouche. The LaRouche publishing house, New Benjamin Franklin House, published Jack's autobiography, Fifty Years a Democrat. Jack and LaRouche founded the Committee for a New Africa Policy, which lobbied for short term aid and long-term infrastructure development for Africa. In 1984, Jack became a founding member and board member of the LaRouche-affiliated Schiller Institute. His daughter said the association was "unfortunate". Death Jack died of cancer on December 19, 1986, in St. Luke's Hospital in Manhattan. He belonged to the Roman Catholic church. He was 79.
LaRouche movement
 Jack became involved with the LaRouche movement, acting as a consultant to the 1980 presidential campaign of Lyndon LaRouche. The LaRouche publishing house, New Benjamin Franklin House, published Jack's autobiography, Fifty Years a Democrat. Jack and LaRouche founded the Committee for a New Africa Policy, which lobbied for short term aid and long-term infrastructure development for Africa. In 1984, Jack became a founding member and board member of the LaRouche-affiliated Schiller Institute. His daughter said the association was "unfortunate". Death
 Jack died of cancer on December 19, 1986, in St. Luke's Hospital in Manhattan. He belonged to the Roman Catholic church. He was 79.