Margaret Higgins Sanger, also known as Margaret Sanger Slee, was an American birth control activist, sex educator, writer, and nurse. Sanger popularized the term "birth control", opened the first birth control clinic in the United States, and established organizations that evolved into the Planned Parenthood Federation of America.
Sanger used her writings and speeches primarily to promote her way of thinking. She was prosecuted for her book Family Limitation under the Comstock Act in 1914. She was afraid of what would happen, so she fled to Britain until she knew it was safe to return to the US. Sanger's efforts contributed to several judicial cases that helped legalize contraception in the United States. Due to her connection with Planned Parenthood, Sanger is a frequent target of criticism by opponents of abortion. However, Sanger drew a sharp distinction between birth control and abortion and was opposed to abortions throughout the bulk of her professional career, declining to participate in them as a nurse. Sanger remains an admired figure in the American reproductive rights movement. She has been criticized for supporting eugenics.