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The Institute for Policy Studies is the largest and most influential of the far left think tanks in Washington. Since its founding in 1964 it has steadily followed a pro-Marxist line on foreign policy, defense and the economy and has spawned a large number of spin-offs, other think tanks and public affairs organizations following the same radical agenda.

To put its policy recommendations into action, IPS built networks of contacts among Congressional legislators and their staffs, academics, government officials, and the national media.

In 1978, in an article in National Review, Brian Crozier, director of the London-based Institute for the Study of Conflict, described IPS as the "perfect intellectual front for Soviet activities which would be resisted if they were to originate openly from the KGB."