Its from the Theses presented to the second World Congress of the Communist International, it was the standard to my understanding for members of the ComIntern to adopt this convention:

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generally binding resolutions shall be passed only on such questions, on which such resolutions are possible.

18. In connection with the above all Parties desiring to join the Communist International must alter their names.

Each Party desirous of joining the Communist International must bear the following name:

Communist Party of such-and-such country (Section of Third Communist International). The question of denomination of a party is not only a formal one, but it is a political question of great importance. The Communist International has declared a decisive war against the whole bourgeois world and all yellow Social Democratic Parties. It is necessary that each rank-and-file worker should be able to distinguish clearly the difference between the Communist Parties and the old official “Social Democratic” or “Socialist” parties, which have betrayed the cause of the working class.