The second part, "A Nation of Scofflaws" looked at the way Prohibition drove illegal activity underground and led to the rise of organized crime as it would dominate the 20th Century. In Chicago, voters were actually beaten for showing up at the wrong primaries. The Volstead Act, which "enforced" the Amendment, was written in a way to allow a lot of private workarounds. But occasionally bosses got caught; one had all his belongings sold underneath him by a disloyal wife while he was in prison.
The third part is called "A Nation of Hypocrites". The Great Depression was being made worse by Prohibition, and people woke up to the idea that they didn't need to tell government how to live all the time, just because of the weakest.