Because Harry Jacob Anslinger wouldn't have anything to do once alcohol was legalized, so he started a campaign against marijuana[1]. https://en.wikipedia.org/

Because Harry Jacob Anslinger wouldn't have anything to do once alcohol was legalized, so he started a campaign against marijuana[1]. https://en.wikipedia.org/wiki/Harry_J._Anslinger#The_campaign_against_marijuana_1930.E2.80.931937 https://en.wikipedia.org/wiki/Harry_J._Anslinger#The_campaig...