Because of his political leanings, Menjou came into conflict with actress Katharine Hepburn, with whom he appeared in "Morning Glory", "Stage Door", and "State of the Union" (also starring Spencer Tracy). Hepburn was strongly opposed to the HUAC hearings, and their clashes were reportedly instant and mutually cutting. During a government deposition, Menjou said, "Scratch a do-gooder, like Hepburn, and they'll yell, 'Pravda'." To this, Hepburn called Menjou "wisecracking, witty—a flag-waving super-patriot who invested his American dollars in Canadian bonds and had a thing about Communists." In his book "Kate", Hepburn biographer William Mann said that during the filming of "State of the Union", she and Menjou spoke to each other only while acting.