Bill Wilson[1], co-founder of Alcoholics Anonymous, believed LSD could help alcoholics achieve a "spiritual experience" that was crucial to them attaining sobriety[2] (incidentally, that a spiritual experience could help alcoholics was an idea he got from Carl Jung[3]). Wilson's own experiences with LSD are discussed in detail here: [4]
In the 50's and 60's there was research in to using LSD to treat alcoholism, with promising results:
"Osmond treated more than 700 chronically alcoholic patients with LSD and ended up with around a 50 percent overall success rate. One of Osmond's most compelling studies took place in the late 1950s with a cohort of subjects from the group Alcoholics Anonymous. This cohort was comprised of individuals that had failed the famous 12-step program, and again Osmond hit his 50 percent success rate, this time with a 12-month follow-up period."[5]
In 2012 a meta-analysis of studies with a total of 536 participants found "evidence for a beneficial effect of LSD on alcohol misuse".[6]
[1] - https://en.wikipedia.org/wiki/Bill_W.
[2] - https://www.theguardian.com/science/2012/aug/23/lsd-help-alc...
[3] - http://barefootsworld.org/wilsonletter.html
[4] - https://aaagnostica.org/2015/05/10/bill-wilsons-experience-w...
[5] - [6] - https://www.ncbi.nlm.nih.gov/pubmed/22406913