Neoconservatism--the term was Michael Harrington's--originated in the 1970s as a movement of anti-Soviet liberals and social democrats in the tradition of Truman, Kennedy, Johnson, Humphrey and Henry ("Scoop") Jackson, many of whom preferred to call themselves "paleoliberals." (...) The movement's focus was on confrontation with the Soviet bloc abroad and on the defense of New Deal liberalism and color-blind liberal integrationism against rivals on the left at home. With the end of the cold war and the ascendancy of the Democratic Leadership Council, many "paleoliberals" drifted back to the Democratic center. Daniel Patrick Moynihan, once spoken of as a possible neoconservative presidential candidate, broke with the movement in the 1980s over its growing contempt for international law and its exaggeration of the Soviet threat. Today's neocons are a shrunken remnant of the original broad neocon coalition.
Nevertheless, the origins of their ideology on the left are still apparent. The fact that most of the younger neocons were never on the left is irrelevant; they are the intellectual (and, in the case of William Kristol and John Podhoretz, the literal) heirs of older ex-leftists. The idea that the United States and similar societies are dominated by a decadent, postbourgeois "new class" was developed by thinkers in the Trotskyist tradition like James Burnham and Max Schachtman, who influenced an older generation of neocons. The concept of the "global democratic revolution" has its origins in the Trotskyist Fourth International's vision of permanent revolution. The economic determinist idea that liberal democracy is an epiphenomenon of capitalism, promoted by neocons like Michael Novak, is simply Marxism with entrepreneurs substituted for proletarians as the heroic subjects of history.
The organization as well as the ideology of the neoconservative movement has left-liberal origins. PNAC is modeled on the Committee on the Present Danger, which in turn was modeled on the Congress for Cultural Freedom, a CIA-funded network of the anti-Communist center-left that sought to counter Stalin's international cultural front groups between the 1940s and the 1960s. Many of the older neocons are veterans of the CCF, including Irving Kristol, who with Stephen Spender co-edited Encounter, the CIA-bankrolled magazine of the movement. European social democratic models inspired the quintessential neocon institution, the National Endowment for Democracy.
(...) Like other schools on the left, neoconservatism recruited from diverse "farm teams," including liberal Catholics (William Bennett and Michael Novak began on the Catholic left) and populists, socialists and New Deal liberals in the South and Southwest (the pool from which Jeane Kirkpatrick, James Woolsey and I were drawn). There were, and are, very few Northeastern WASP mandarins in the neoconservative movement, for the same reason that there were few on the older American left, which tended to mirror the New Deal coalition of ethnic and regional outsiders.