To the Comintern, a decisive and final revolutionary upheaval was afoot and all its sections had to prepare for the immediate advent of world revolution. As part of this theory, because the Comintern felt that conditions were strong enough, it demanded that its political positions within the workers’ movement be consolidated and that all "reactionary" elements be purged. Accordingly, attacks and expulsions were launched against social democrats and moderate socialists within labour unions where the local CP had majority support, as well as Trotskyists and united front proponents.