During the Cold War, the KGB actively sought to combat "ideological subversion" – anti-communist political and religious ideas and the dissidents who promoted them – which was generally dealt with as a matter of national security in discouraging influence of hostile foreign powers. After denouncing Stalinism in his secret speech On the Personality Cult and its Consequences in 1956, head of state Nikita Khrushchev lessened suppression of "ideological subversion". As a result, critical literature re-emerged, including the novel One Day in the Life of Ivan Denisovich (1962), by Aleksandr Solzhenitsyn, who was code-named PAUK ("spider") by the KGB. After Khrushchev's deposition in 1964, Leonid Brezhnev reverted the State and KGB to active, harsh suppression; house searches to seize documents and the continual monitoring of dissidents became routine again. To wit, in 1965, such a search-and-seizure operation yielded Solzhenitsyn manuscripts of "slanderous fabrications", and the subversion trial of the novelists Andrei Sinyavsky and Yuli Daniel; Sinyavsky (alias "Abram Tertz"), and Daniel (alias "Nikolai Arzhak"), were captured after a Moscow literary-world informant told KGB when to find them at home.[20]