Geer became a member of the Communist Party of the United States in 1934. Geer was also influential in introducing Harry Hay to organizing in the Communist Party. In 1934, Geer and Hay gave support to a labor strike of the port of San Francisco; the 1934 West Coast waterfront strike which lasted 83 days. Though marred by violence, it was an organizing triumph, one that became a model for future union strikes. Geer became a reader of the West Coast Communist newspaper "People's World".