 Complete the following phrase:  Under the impact of the Hungarian Revolution of 1956, members of the Left Wing Caucus became convinced that the Stalinist bureaucracy was not a new ruling bureaucratic collectivist class, as Shachtman had insisted, but instead a brittle and unstable caste, as Trotsky had argued. Wohlforth, Mage and Robertson launched the Young Socialist in October 1957 and founded the associated Young Socialist Clubs; they joined the Trotskyist Socialist Workers Party SWP. In response to the formation of a Tibetan Brigade at the University of California at Berkeley in 1959, Robertson wrote a leaflet enthusiastically supporting the Chinese states suppression of what he considered to be a CIA-backed 