When was Dalton Trumbo summoned before the House Committee on Un-American activities? In 1947. The screenwriter and author of Johnny Got His Gun (1939) was imprisoned and blacklisted for his refusal to answer questions about his Communist affiliations.
Excerpted from: Corey, Melinda, and George Ochoa. Literature: The New York Public Library Book of Answers. New York: Simon and Schuster, 1993.