Of course! Whether it's plots to assassinate powerful people, or police setups like Sacco & Vanzetti, or FBI's CoIntelPro infiltration, sabotage, setup and assassination program of all US revolutionary groups of the 50s/60s (Black Panthers, Young Lords, MOVE..)

If you're strictly speaking about marxism-leninism, which as an anarchist i do not recognize as a form of communism (but rather a form of State capitalism), that's also the case long before Stalin came in. Notoriously, the revolt of the Kronstadt soviet in 1921 was framed by Lenin and Trotsky as counter-revolutionary, see: https://en.wikisource.org/wiki/Trotsky_Protests_Too_Much

However, communism as a political perspective (whether libertarian or authoritarian) promotes mutual aid and emulation as principles of organizing society, not competition. So my specific critique of capitalist mindset/education/system as a major factor in the development of actual conspiracies does not really apply to communist ideas in themselves.