“As Commissar for the Armed Forces and a member of the Politburo he [Trotsky] still appeared powerful, but by 1923 he was isolated and helpless. All his former tergiversations were turned against him. When he came to realize his situation he attacked the bureaucratization of the party and the stifling of intra-party democracy: like all overthrown Communist leaders he became a democrat as soon as he was ousted from power. However, it was easy for Stalin and Zinovyev to show not only that Trotsky’ s democratic sentiments and indignation at party bureaucracy were of recent date, but that he himself, when in power, had been a more extreme autocrat than anyone else: he had supported or initiated every move to protect party "unity", had wanted – contrary to Lenin’ s policy – to place the trade unions under state control and to subject the whole economy to the coercive power of the police, and so on. In later years Trotsky claimed that the policy, which he had supported, of prohibiting "fractions" was envisaged as an exceptional measure and not a permanent principle. But there is no proof that this was so, and nothing in the policy itself suggests that it was meant to be temporary. It may be noted that Zinovyev showed more zeal than Stalin in condemning Trotsky – at one stage he was in favour of arresting him – and thus supplied Stalin with useful ammunition when the two ousted leaders tried, belatedly and hopelessly, to join forces against their triumphant rival.”

pg. 21
Main Currents Of Marxism (1978), Three Volume edition, Volume III: The Breakdown