What were purity crusaders?

Answer 1

They were a group of people that supported moral reforms and wanted to get rid of all vice and sin during the Progressive Movement. Their leader was Anthony Comstock. Two successes they had were the Comstock Law (made the distribution about Birth Control information illegal) and another law (unnamed?) making immoral things in the mail illegal.

Answer 2

They where a group of people who wanted moral reform in the late 1800's to the early 1900's. Some of the things they supported where prohibition, and the eradication or VD. They where often criticized for they imposed their views on others and sometimes came off as thinking that they were better. They also ran into trouble with their view vs. the scientific reformers. An example of this would be hookworm.