Back to Modern History SourceBook Modern History Sourcebook: The Brezhnev Doctrine, 1968 In reponse to the efforts, early in 1968, of the Czechoslovakian Communist Party, under the leadership of Alexander Dubcek, to introduce a number of reforms, including the abolition of censorship, the Soviet Union adopted a policy of combating anti-socialist forces . The polict became known as Brezhnev ...