And, there is good evidence they, along with U.S. Leftist supporters, have been at least since the early to mid-60's.
At stake was Russia's greater percentage of GNP investment in the Vietnam war than that of the U.S.; and, its anti-U.S. interests continue.
The Russian Spooks in the Seattle area had plenty of hate America/Americans to recruit for their intel and ????
Most of these American born traitors probably worked for free.