Lets just say that the cost-benefit analysis for such actions aren't worth it for either parties and would act as a poison pill for recipients and as a form of blowback for the donor. Anything that makes domestic communist movements even give off the whiff of being foreign-backed poisons whatever credibility they wish to establish.

I'm telling you this both out of historical precedent and from experience, seeking or accidentally receiving foreign funding of any sort is a bad idea for communists in the imperial core.