The WPC led the international peace movement in the decade after the Second World War, but its failure to speak out against the Soviet suppression of the 1956 Hungarian uprising and the resumption of Soviet nuclear tests in 1961 marginalised it, and in the 1960s it was eclipsed by the newer, non-aligned peace organizations like the Campaign for Nuclear Disarmament. At first, Communists denounced the Campaign for Nuclear Disarmament for "splitting the peace movement" but they were compelled to join it when they saw how popular it was.