I know that each Soviet Republic X had its own Communist Party of X. Question is: were members of these parties also members of the CPSU?
I am interested here only in the formal side of things - I'd like to know if there was a formal dual membership (entailing two documents the member had to possess) or if each CP of X was considered a collective member of the CPSU. Or other arrangements I haven't thought of, perhaps.
Also - which normative document defined these things? As far as I remember, the Constitution of the USSR only mentioned the CPSU, not the CP of X parties, and (again, as far as I remember) the Republics did not have their own constitutions (thought they did have separate penal codes). So did the CP of X parties exist in a juridical limbo?
P.S. Curiously, the only republic that did not have its own separate party was.... Russia. Once you think a bit about it, it makes a lot of sense, actually... :)