John Steinbeck allowing Steinbeck to spend a full day on the set of "The Grapes of Wrath" and the next day on the set of "Of Mice and Men." In the 1930s and 1940s, Ed Ricketts strongly influenced Steinbeck's writing. Steinbeck frequently took small trips with Ricketts along the California coast to give himself time off from his writing and to collect biological specimens, which Ricketts sold for a living. Their joint book about a collecting expedition to the Gulf of California in 1940, which was part travelogue and part natural history, published just as the U.S. entered World War II, never
John Steinbeck Wrath", in which themes of conversion and self-sacrifice play a major part in the characters Casy and Tom who achieve spiritual transcendence through conversion. Steinbeck's contacts with leftist authors, journalists, and labor union figures may have influenced his writing. He joined the League of American Writers, a Communist organization, in 1935. Steinbeck was mentored by radical writers Lincoln Steffens and his wife Ella Winter. Through Francis Whitaker, a member of the Communist Party USA's John Reed Club for writers, Steinbeck met with strike organizers from the Cannery and Agricultural Workers' Industrial Union. In 1939, he signed a letter with some