Crusading publisher
McCormick returned from the war and took control of the Tribune in the 1920s. Given the lack of schools of journalism in the midwestern United States at the time, McCormick and Patterson sponsored a school named for their grandfather, the Joseph Medill School of Journalism. It was announced by Walter Dill Scott in November 1920, and began classes in 1921.
As publisher of the Tribune, McCormick was involved in a number of legal disputes regarding freedom of the press that were handled by McCormick's longtime lawyer Weymouth Kirkland. The most famous of these cases is Near v. Minnesota, 283 U.S. 697 (1931), a case championed by McCormick in his role as chairman of the American Newspaper Publishers Association's Committee on Free Speech.
In 1919, automobile magnate Henry Ford sued the Chicago Tribune and Robert McCormick for libel after the Tribune called him an “anarchist” in an editorial. The Tribune’s writer used the term in response to Ford’s opposition to President Woodrow Wilson sending military forces to the Mexican border in 1916 and Ford calling soldiers “murderers.” The trial lasted over the summer of 1919 and several prominent witnesses including generals were called to testify. So too were three history professors, Columbia University’s William Archibald Dunning, Ohio State University’s Francis Coker (who earned his Ph.D under Dunning), and University of Michigan’s Jesse Siddall Reeves. As expert witnesses, the three provided differing definitions of anarchism which, unlike Marxism, had no philosophical “father.” In the end Ford prevailed on the question of whether he was libeled but the jury only awarded him six cents and he asked for $1million.
A conservative Republican, McCormick was an opponent of President Franklin D. Roosevelt and compared the New Deal to Communism. For a period in 1935, he protested Rhode Island's Democratic judiciary by displaying a 47-star flag outside the Tribune building, with the 13th star (representing Rhode Island) removed; he relented after he was advised that alteration of the American flag was unlawful.
He was also an America First non-interventionist who strongly opposed entering World War II "to rescue the British Empire". He famously published the "Victory Program," a military plan that FDR had ordered in the summer of 1941 to prepare the United States for possible entry into World War II. It had been leaked to him by US Senator Burton K. Wheeler. The publication was on December 4, 1941, only three days before the Japanese attack on Pearl Harbor. The controversy it stirred died off quickly after the December 7 attack. In June 1942, the Tribune published an article that indicated that the Americans had broken Japanese codes, the 1942 Chicago Tribune incident.
As a publisher he was very innovative. McCormick was a 25 percent owner of the Tribune's 50,000 watt radio station, which was purchased in 1924; he named it WGN, the initials of the Tribune's motto, the "World's Greatest Newspaper". He also established the town of Baie-Comeau, Quebec in 1936 and constructed a paper mill and a hydroelectric power plant there named McCormick Dam to generate electricity for the mill.
McCormick carried on crusades against various local, state, and national politicians, gangsters and racketeers, labor unions, prohibition and prohibitionists, Wall Street, the East and Easterners, Democrats, the New Deal and the Fair Deal, liberal Republicans, the League of Nations, the World Court, the United Nations, British imperialism, socialism, and communism. Besides Roosevelt, his chief targets included Chicago Mayor William Hale Thompson and Illinois Governor Len Small.
Some of McCormick's personal crusades were seen as quixotic (such as his attempts to reform spelling of the English language) and were parodied in political cartoons in rival Frank Knox's Chicago Daily News. Knox's political cartoonists, including Cecil Jensen, derided McCormick as "Colonel McCosmic", a "pompous, paunchy, didactic individual with a bristling mustache and superlative ego."
In 1943, he told an audience he helped plan a defence against an invasion from Canada at the end of World War I.
In June 1947, he gave a 100-year birthday party for the Tribune that included a fireworks show called "the most colossal show since the Chicago fire."
Other publications noted that everything about the celebration was called "the world's greatest". Time magazine editorialized that "the Tribune has been made into a worldwide symbol of reaction, isolation, and prejudice by a man capable of real hate."
McCormick had purchased the Washington Times-Herald newspaper following the 1948 death of Eleanor Medill "Cissy" Patterson, his first cousin. The paper was an "isolationist and archconservative" publication known for sensationalism.
McCormick appointed his niece, then known as Ruth "Bazy" McCormick Miller as the publisher of the paper in 1949. He wanted Bazy to use the paper to create "an outpost of American principles". When the two came to a parting of the ways over her relationship with one of the paper's editors, Garvin Tankersley, as well as editorial control over the paper, he ordered her to choose between Tankersley and the Tribune Company. As a result, she resigned from the Times-Herald. Bazy later said, "I understood when I went to the Times-Herald I was to have full control. That control was not given me ... There is some difference in our political beliefs. I have broader Republican views than [McCormick] has. I am for the same people as the colonel, but I am for some more people.
McCormick tried to run the paper himself, but lost money on the venture, and sold the Times-Herald to The Washington Post in 1954. When he announced the sale, one of the paper's board members insisted that Bazy be given a chance to purchase it, so McCormick gave her 48 hours to match the $10 million asking price. She could not raise the money to do so. Upon the purchase of the Times-Herald, the Post consolidated its market position by discontinuing the rival paper. In 1955 he cofounded the American Security Council, an anti-communist organization.