As a U.S. Congressman, Thomas was a staunch conservative opponent of President Franklin D. Roosevelt and his New Deal, claiming the President's legislative agenda had "sabotaged the capitalist system." Thomas opposed government support for the Federal Theatre Project declaring that "practically every play presented under the auspices of the Project is sheer propaganda for Communism or the New Deal." In 1949 Thomas called the U.S. Secretary of Defense, James Forrestal, "the most dangerous man in America" and claimed that if Forrestal were not removed from office he would "cause another world war."
Demobilization
In the post-war period, Thomas called for a rapid demobilization of the American military. In 1946, he invited General Dwight Eisenhower to his office to discuss the issue. When he arrived, the general was faced with a table surrounded by soldier's wives, many holding babies. News photographers took photos of the furious Eisenhower.
HUAC
After the Republican Party gained control of the 80th Congress in the November 1946 elections, Thomas was appointed chairman of the House Committee on Un-American Activities –during that period, also called the "Thomas Committee." In May 1947, Thomas traveled to Hollywood to meet with film industry executives with a view to exposing what he believed was Communist infiltration of motion pictures content by members of the Screen Writers Guild. Returning to Washington, D.C., he shifted the focus of the committee to what he called the "subversives" working in the film business. Under Thomas, in October 1947, HUAC summoned suspected Communists to appear for questioning. These summonses led to the conviction and imprisonment for contempt of Congress of the "Hollywood Ten" who had refused to answer the Committee's questions, citing the First Amendment.
Corruption charges and imprisonment
Prominent American columnists Jack Anderson and Drew Pearson were critical of Thomas and his committee's methods. Rumors about corrupt practices on the part of Thomas were confirmed when his secretary, Helen Campbell, sent documents to Pearson which he used to expose Thomas' corruption in an August 4, 1948, newspaper article. The fraud had begun on New Year's Day of 1940, when Thomas placed Campbell's niece, Myra Midkiff, and Campbell's maid, Arnette Minor on his payroll as clerks. Midkiff earned roughly $1,200 a year and was to kick back her entire salary to the Congressman. Through this practice, he would also evade a tax bracket increase. The arrangement lasted for four years. As a result, Thomas and Campbell were summoned to answer to charges of salary fraud before a grand jury. Thomas refused to answer questions, citing his Fifth Amendment rights, the most common stance for which he had criticized accused Communists. Indicted, Thomas was tried and convicted of fraud, fined and given an 18-month prison sentence. He resigned from Congress on January 2, 1950. In an ironic twist, he was imprisoned in Danbury Prison where Lester Cole and Ring Lardner Jr., both members of the "Hollywood Ten" were serving time because of Thomas' inquiries into the film industry.
Post-prison
After his release from prison, Thomas was an editor and publisher of three weekly newspapers in Bergen County, New Jersey. President Harry S. Truman pardoned Thomas on Christmas Eve of 1952. In 1954, Thomas tried to re-enter politics, but was defeated for the Republican Party nomination for Congress.
Death
Thomas died in 1970 in St. Petersburg, Florida, aged 75, of undisclosed causes. He was cremated, and his ashes were interred in the Elmgrove Cemetery in Mystic, Connecticut.
Depictions
In the 2015 film Trumbo, Thomas is portrayed by James Dumont.
