Idealism and materialism are the only two philosophies that count (Lenin, Stalin)
Lenin and Stalin believed there are two major camps throughout all of philosophy: materialists and idealists. There is no other camp. These camps cannot be transcended or merged.1
Idealism is merely a subtle, refined form of fideism, which stands fully armed, commands vast organizations and steadily continues to exercise an influence on the masses, turning the slightest vacillation in philosophical thought to its own advantage.
In reality, they were hostile to Marxism, for they tried to undermine its theoretical foundations, although they hypocritically denied their hostility to Marxism and two-facedly continued to style themselves Marxists.