I have written in the past about the "Annals of Communism Series" at Yale University. They just released a new batch of documents related to the Comintern and the fight for global Communism in the Thirties.
One of the documents about "the work of exposing “the wreckers in the ECCI.” included the phrase "The proof of this are the recent [and] blatant facts regarding Fritz David, the miscreant agent of the counterrevolutionaries Trotsky-Zinoviev-Kamenev, who stretched their bloody hands towards the heart and brain of the working class party, towards the VKP(b)’s Central Committee, and towards [its] leader com. Stalin."
This must have been written to the foreign Communist parties in an attempt to explain the purges by Stalin in the late Thirties. The ECCI was the Comintern's Executive Committee which was made up of international representatives.
You just don't see the phrase "the miscreant agent of the counterrevolutionaries Trotsky-Zinoviev-Kamenev," anymore.