Prohibition is pretty popular topic, and I wonder if this question has been asked before. So I started by typing only the word "prohibition" in the "search reddit" box and checking "limit my search to /r/askhistorians".

http://www.reddit.com/r/AskHistorians/search?q=prohibition&restrict_sr=on

Several question that were previously answered might be interesting to OP, but this one is worded almost exactly the same. It's about the 12th question from the list above.

http://www.reddit.com/r/AskHistorians/comments/1i7vb0/what_happened_to_those_convicted_of_prohibition/

Hope that helps.

Edit: Thank you for the gold. I will pay it forward.