A great example in Influence Warfare (and it is 5GW-ish too) from USNAVYVET2002:
The GRU and the KGB helped to fund just about every antiwar movement and organization in America and abroad. Funding was provided via undercover operatives or front organizations. These would fund another group that in turn would fund student organizations. The GRU also helped Vietnam fund its propaganda campaign as a whole.
What will be a great surprise to the American people is that the GRU and KGB had a larger budget for antiwar propaganda in the United States that it did for economic and military support of the Vietnamese. The antiwar propaganda cost the GRU more than $1 billion, but as history shows, it was a hugely successful campaign and well worth the cost. The antiwar sentiment created an incredible momentum that greatly weakened the U.S. military.” [On page 78 of Stanislav Lunev’s and Ira Winkler’s book titled “Through the Eyes of the Enemy”]