In late 1924, Stalin moved against Kamenev and Zinoviev, removing their supporters from key positions. In 1925, the two moved into open opposition to Stalin and Bukharin. At the 14th Party Congress in December, they launched an attack against Stalin's faction, but it was unsuccessful. Stalin in turn accused Kamenev and Zinoviev of reintroducing factionalism — and thus instability — into the party. In mid-1926, Kamenev and Zinoviev joined with Trotsky's supporters to form the United Opposition against Stalin; in October they agreed to stop factional activity under threat of expulsion, and later publicly recanted their views under Stalin's command. The factionalist arguments continued, with Stalin threatening to resign in October and then December 1926 and again in December 1927. In October 1927, Zinoviev and Trotsky were removed from the Central Committee; the latter was exiled to Kazakhstan and later deported from the country in 1929. Some of those United Opposition members who were repentant were later rehabilitated and returned to government.