I don’t even think that article adequately conveys how thoroughly racist the roots of it is. They don’t even quote the awful things Anslinger said to justify cannabis prohibition.

“There are 100,000 total marijuana smokers in the US, and most are Negroes, Hispanics, Filipinos, and entertainers. Their Satanic music, jazz, and swing, result from marijuana use. This marijuana causes white women to seek sexual relations with Negroes, entertainers, and any others.”

“…the primary reason to outlaw marijuana is its effect on the degenerate races.”

“Marijuana is an addictive drug which produces in its users insanity, criminality, and death.”

“Reefer makes darkies think they’re as good as white men.”

“Marihuana leads to pacifism and communist brainwashing”

“You smoke a joint and you’re likely to kill your brother.”

“Marijuana is the most violence-causing drug in the history of mankind.”

https://fee.org/articles/the-racist-roots-of-marijuana-prohibition/

And then there’s this from Nixon staffer John Ehrlichman:

“The Nixon campaign in 1968, and the Nixon White House after that, had two enemies: the antiwar left and black people,” former Nixon domestic policy chief John Ehrlichman told Harper’s writer Dan Baum for the April cover story published Tuesday.

“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,” Ehrlichman said. “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.cnn.com/2016/03/23/politics/john-ehrlichman-richard-nixon-drug-war-blacks-hippie/index.html