"There is a certain degree of cynicism one can develop in looking at social and power structures in the world. But sometimes you come across something so unexpected that it is like a sharp slap in the face. Dan Baum's mention of his interview with John Ehrlichman, counsel and Assistant to the President for Domestic Affairs under Nixon, in the latest issue of Harper's is one of those moments.
The Nixon campaign in 1968, and the Nixon White House after that, had two enemies: the antiwar left and black people. You understand what I’m saying? We knew we couldn't make it illegal to be either against the war or black, but by getting the public to associate the hippies with marijuana and blacks with heroin, and then criminalizing both heavily, we could disrupt those communities. We could arrest their leaders, raid their homes, break up their meetings, and vilify them night after night on the evening news. Did we know we were lying about the drugs? Of course we did."
https://www.forbes.com/sites/eriksherman/2016/03/23/nixons-drug-war-an-excuse-to-lock-up-blacks-and-protesters-continues/#6b1514b842c8