"On the basis of this economic depression the bourgeoisie will be compelled to exert stronger and stronger pressure upon the working class. This is already to be seen in the cutting of wages which has started in the full-blooded capitalist countries: in America and in England, and then throughout all of Europe. This leads to great struggles over wages. Our task is to extend these struggles, by basing ourselves on a clear understanding of the economic situation… . Many comrades say that if an improvement takes place in this epoch it would be fatal for our revolution. No, under no circumstances. In general, there is no automatic dependence of the proletarian revolutionary movement upon a crisis. There is only a dialectical interaction. It is essential to understand this. "
excerpt from the first volume of The First Five Years of the Communist International by Leon Trotsky