 While in Congress, Clardy shared Senator Joseph McCarthy's anti-communist sentiments and participated in House Committee on Un-American Activities (HUAC) hearings.Clardy conducted HUAC hearings in November 1953 in Lansing, Michigan, in which the committee subpoenaed University of Michigan mathematics instructor Chandler Davis, pharmacology professor Mark Nickerson, and zoology professor Clement Markert.In May 1954 he conducted another HUAC hearing in Flint, Michigan, in which he reportedly "not only abused the witnesses but incited violence against them."