I have never seen this information before. I have been reading the FBI reports on VVAW and they were getting money from a communist party of a country in Europe, the Communist Party of America, and from dealing drugs. Also VVAW was getting directions from the NV Government.
I've not seen the information discussed much, just mentioned in passing like in the passage I quote. I suspect a thorough combing of the Watergate tapes and related material would shed additional light.