[1] A staunch anti-communist, Dilworth sponsored legislation to prevent Communists from employment in the state government.

[1] Dilworth authored the Fourth Report of the Senate Fact-Finding Committee on Un-American Activities, 1948: Communist Front Organizations.

This committee produced several reports relating to alleged communists in education in California, including its Third Report in 1952,[6] which identified that Kenneth MacGowan, employed by the University of California Berkeley, "has been affiliated with ... Communist front organizations" including the Motion Picture Artist's Committee and the Hollywood Democratic Party.

Jean Wilkinson was dismissed as a teacher after refusing to answer questions before a California State Senate UnAmerican Activities Committee hearing which was investigating her husband.

Dilworth is quoted as saying,"It is often true that many things which, in the end, bring benefits and satisfaction are very difficult to get started in the beginning.