As the non-aligned peace movement "was constantly under threat of being tarnished by association with avowedly pro-Soviet groups", many individuals and organizations "studiously avoided contact with Communists and fellow-travellers." Some western delegates walked out of the Wroclaw conference of 1948, and in 1949 the World Pacifist Meeting warned against active collaboration with Communists. In the same year, several members of the British Peace Pledge Union, including Vera Brittain, Michael Tippett, and Sybil Morrison, criticised the WPC-affiliated British Peace Committee for what they saw as its "unquestioning hero-worship" of the Soviet Union. In 1950, several Swedish peace organizations warned their supporters against signing the WPC's Stockholm Appeal. In 1953, the International Liaison Committee of Organizations for Peace stated that it had "no association with the World Peace Council". In 1956, a year in which the WPC condemned the Suez war but not the Russian suppression of the 1956 Hungarian uprising, the German section of War Resisters International condemned it for its failure to respond to Soviet H-bomb tests. In Sweden, Aktionsgruppen Mot Svensk Atombomb discouraged its members from participating in Communist-led peace committees. The WPC attempted to co-opt the eminent peace campaigner Bertrand Russell, much to his annoyance, and in 1957 he refused the award of the WPC's International Peace Prize. In Britain, CND advised local groups in 1958 not to participate in a forthcoming WPC conference. In the US, SANE rejected WPC appeals for co-operation. A final break occurred during the WPC's 1962 World Congress for Peace and Disarmament in Moscow. The WPC had invited non-aligned peace groups, who were permitted to criticize Soviet nuclear testing, but when western activists including the British Committee of 100 tried to demonstrate in Red Square against Soviet weapons and the Communist system, their banners were confiscated and they were threatened with deportation. As a result of this confrontation, 40 non-aligned organizations decided to form a new international body, the International Confederation for Disarmament and Peace, which was not to have Soviet members.