Stalin: I think that the source of the contradictions within the proletarian parties lies in two circumstances. What are these circumstances? They are, firstly, the pressure exerted by the bourgeoisie and bourgeois ideology on the proletariat and its party in the conditions of the class struggle—a pressure to which the least stable strata of the proletariat, and, hence, the least stable strata of the proletarian party, not infrequently succumb. It must not be thought that the proletariat is completely isolated from society, that it stands outside society. The proletariat is a part of society, connected with its diverse strata by numerous threads. But the party is a part of the proletariat. Hence the Party cannot be exempt from connections with, and from the influence of, the diverse sections of bourgeois society. The pressure of the bourgeoisie and its ideology on the proletariat and its party finds expression in the fact that bourgeois ideas, manners, customs and sentiments not infrequently penetrate the proletariat and its party through definite strata of the proletariat that are in one way or another connected with bourgeois society. They are, secondly, the heterogeneity of the working class, the existence of different strata within the working class. I think that the proletariat, as a class, can be divided into three strata. One stratum is the main mass of the proletariat, its core, its permanent part, the mass of "pure-blooded" proletarians, who have long broken off connection with the capitalist class. This stratum of the proletariat is the most reliable bulwark of Marxism. The second stratum consists of newcomers from non-proletarian classes—from the peasantry, the petty bourgeoisie or the intelligentsia. These are former members of other classes who have only recently merged with the proletariat and have brought with them into the working class their customs, their habits, their waverings and their vacillations. This stratum constitutes the most favourable soil for all sorts of anarchist, semi-anarchist and "ultra-Left" groups. The third stratum, lastly, consists of the labour aristocracy, the upper stratum of the working class, the most well-to-do portion of the proletariat, with its propensity for compromise with the bourgeoisie, its predominant inclination to adapt itself to the powers that be, and its anxiety to "get on in life." This stratum constitutes the most favourable soil for outright reformists and opportunists. Notwithstanding their superficial difference, these last two strata of the working class constitute a more or less common nutritive medium for opportunism in general—open opportunism, when the sentiments of the labour aristocracy gain the upper hand, and opportunism camouflaged with "Left" phrases, when the sentiments of the semi-middle-class strata of the working class which have not yet completely broken with the petty-bourgeois environment gain the upper hand. The fact that "ultra-Left" sentiments very often coincide with the sentiments of open opportunism is not at all surprising. Lenin said time and again that the "ultra-Left" opposition is the reverse side of the Right-wing, Menshevik, openly opportunist opposition. And that is quite true. If the "ultra-Lefts" stand for revolution only because they expect the victory of the revolution the very next day, then obviously they must fall into despair and be disillusioned in the revolution if the revolution is delayed, if the revolution is not victorious the very next day. Naturally, with every turn in the development of the class struggle, with every sharpening of the struggle and intensification of difficulties, the differences in the views, customs and sentiments of the various strata of the proletariat must inevitably make themselves felt in the shape of definite disagreements within the party, and the pressure of the bourgeoisie and its ideology must inevitably accentuate these disagreements by providing them with an outlet in the form of a struggle within the proletarian party. wordsmith.social/protestation/…