 After his discharge, Heinlein attended a few weeks of graduate classes in mathematics and physics at the University of California at Los Angeles (UCLA), but he soon quit either because of his health or from a desire to enter politics.Heinlein supported himself at several occupations, including real estate sales and silver mining, but for some years found money in short supply.Heinlein was active in Upton Sinclair's socialist End Poverty in California movement (EPIC) in the early 1930s.