Kamenev continued to oppose Stalin throughout 1926 and 1927, resulting in his expulsion from the Central Committee in October 1927. After the expulsion of Zinoviev and Trotsky from the Communist Party on 12 November 1927, Kamenev was the United Opposition's chief spokesman within the Party, representing its position at the XVth Party Congress in December 1927. Kamenev used the occasion to appeal for reconciliation among the groups. His speech was interrupted 24 times by his opponents - Bukharin, Ryutin, and Kaganovich, making it clear that Kamenev's attempts were futile. The Congress declared United Opposition views incompatible with Communist Party membership; it expelled Kamenev and dozens of leading Oppositionists from the Party. This paved the way for mass expulsions in 1928 of rank-and-file Oppositionists, as well as sending prominent Left Oppositionists into internal exile.