Margaret Sanger opened the first birth control clinic in the US in 1916. It was open for 10 days, giving women advice about contraception. For this she was arrested for breaking obscenity laws and was sent to prison for 30 days. She spent her time there teaching women about birth control.

Later she went on to found The Planned Parenthood Federation of America.

Photo: Margaret Sanger (left) outside court, awaiting trial.