Career
Harrington's estrangement from religion was accompanied by an increasing interest in Marxism and secular socialism. After leaving The Catholic Worker, Harrington became a member of the Independent Socialist League (ISL), a small organization associated with the former Trotskyist activist Max Shachtman. Harrington and Shachtman believed that socialism, which they believed implied a just and fully democratic society, could not be realized by authoritarian communism, and were fiercely critical of the "bureaucratic collectivist" states in Eastern Europe and elsewhere.
In 1955, Harrington was placed on the FBI Index, whose master list contained more than 10 million names in 1939. From the 1950s through to the 1970s, FBI director J. Edgar Hoover added an untold number of names of U.S. activists he considered "dangerous characters", to be placed in detention camps in case of a national emergency. Later, Harrington was added to the master list of Nixon political opponents.
After Norman Thomas's Socialist Party of America absorbed Shachtman's ISL in 1957, Harrington endorsed Shachtman's strategy of working as part of the Democratic Party rather than sponsoring candidates as Socialists. Although Harrington identified personally with the socialism of Thomas and Eugene Debs, the most consistent thread running through his life and his work was a "left wing of the possible within the Democratic Party."
Harrington served as the first editor of New America, the official weekly newspaper of the Socialist Party-Social Democratic Federation, founded in October 1960. In 1962, he published The Other America: Poverty in the United States, a book that has been credited with sparking John F. Kennedy's and Lyndon Johnson's War on Poverty. For The Other America, Harrington was awarded a George Polk Award and The Sidney Award. He became a widely read intellectual and political writer, in 1972 publishing a second bestseller, Socialism. His voluminous writings included 14 other books and scores of articles, published in such journals as Commonweal, Partisan Review, The New Republic, Commentary, and The Nation.
Harrington often debated classical liberals/libertarians like Milton Friedman and conservatives like William F. Buckley Jr. He also debated younger left-wing radicals.
Harrington was present in June 1962 at the founding conference of Students for a Democratic Society. In clashes with Tom Hayden and Alan Haber, he argued that their Port Huron Statement was insufficiently explicit about excluding communists from their vision of a New Left. Arthur M. Schlesinger, Sr. called Harrington the "only responsible radical" in America. Ted Kennedy said, "I see Michael Harrington as delivering the Sermon on the Mount to America," and "among veterans in the War on Poverty, no one has been a more loyal ally when the night was darkest."
In July 1968 Harrington was elected chairman (later co-chairman) of the Socialist Party, but by the early 1970s the governing faction of the Socialist Party continued to endorse a negotiated peace to end the Vietnam War, a stance that he came to believe was no longer viable. The party's continued rightward shift eventually lead him to resign from his position as co-chairman in October 1972, shortly before the party's national convention in December, where a majority of delegates at the convention voted to formally dissolve the party into the Social Democrats, USA. Harrington left, and with his former caucus, formed the Democratic Socialist Organizing Committee. A smaller faction, associated with peace activist David McReynolds, formed the Socialist Party USA.
Harrington was appointed a professor of political science at Queens College in Flushing, New York City, in 1972. He wrote 16 books and was named a distinguished professor of political science in 1988. Harrington is also credited with coining the term neoconservatism in 1973.
Harrington said that socialists had to go through the Democratic Party to enact their policies, reasoning that the socialist vote had declined from a peak of approximately one million in the years around World War I to a few thousand by the 1950s. He considered running for the Democratic presidential nomination in 1980 against President Jimmy Carter, but decided against it after Senator Ted Kennedy announced his campaign. He later endorsed Kennedy and said, "if Kennedy loses or is driven out of this campaign, it will be a loss for the left".
In 1982, the Democratic Socialist Organizing Committee merged with the New American Movement, an organization of New Left activists, forming the Democratic Socialists of America (DSA). It was the principal U.S. affiliate of the Socialist International, which includes socialist and labour parties such as the Swedish and German Social Democrats and the British Labour Party, until it voted to leave in 2017. Harrington and Barbara Ehrenreich were elected co-chairs of DSA. Harrington remained chairman of DSA from its inception to his death.
During the 1980s, Harrington contributed commentaries to National Public Radio.