In the aftermath of the Prague Spring's suppression, Brezhnev announced that the Soviet Union had the right to interfere in the internal affairs of its satellites to "safeguard socialism". This became known as the Brezhnev Doctrine, although it was really a restatement of existing Soviet policy, as enacted by Khrushchev in Hungary in 1956. Brezhnev reiterated the doctrine in a speech at the Fifth Congress of the Polish United Workers' Party on 13 November 1968: