https://www.npr.org/2021/07/07/ [login to see] /how-an-anti-vice-crusader-sabotaged-the-early-birth-control-movement
In 1873, Congress passed a law outlawing the distribution, sale, mailing and possession of "obscene" materials — including contraception.
The Comstock Act, as it became known, was named after Anthony Comstock, an anti-vice crusader who later became a special agent to the U.S. Post Office, giving him the power to enforce the law. In her new book, The Man Who Hated Women, author Amy Sohn writes about Comstock — as well as eight women charged with violating the Comstock Act.
While working for the post office, Sohn says, Comstock "decoyed people" by using the mail to solicit obscenity and contraception.