In apartheid in South Africa the government conducted extensive studies on using drugs as population control for black people, alcohol was on the list of drugs tested. You can read more about it here, this is no conspiracy:
https://www.enca.com/south-africa/inside-dr-deaths-laboratory
https://en.wikipedia.org/wiki/Wouter_Basson
https://www.semanticscholar.org/paper/Project-Coast%3A-eugenics-in-apartheid-South-Africa.-Singh/ae2c85fc1ac455eca009de5bd0b823248d0e75d0
https://en.wikipedia.org/wiki/Project_Coast