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Margaret Higgins Sanger (born Margaret Louise Higgins, September 14, 1879 - September 6, 1966, 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.

Some countries in northwestern Europe had more liberal policies towards contraception than the United States at the time, and when Sanger visited a Dutch birth control clinic in 1915, she learned about diaphragms and became convinced that they were a more effective means of contraception than the suppositories and douches that she had been distributing back in the United States. Diaphragms were generally unavailable in the United States, so Sanger and others began importing them from Europe, in defiance of United States law.  On October 16, 1916, Sanger opened a family planning and birth control clinic at 46 Amboy Street in the Brownsville neighborhood of Brooklyn, the first of its kind in the United States. Nine days after the clinic opened, Sanger was arrested. Sanger's bail was set at $500 and she went back home. Sanger continued seeing some women in the clinic until the police came a second time. This time, Sanger and her sister, Ethel Byrne, were arrested for breaking a New York state law that prohibited distribution of contraceptives. Sanger was also charged with running a public nuisance. Sanger and Byrne went to trial in January 1917. Byrne was convicted and sentenced to 30 days in a workhouse but went on a hunger strike. She was force-fed, the first woman hunger striker in the US to be so treated. Only when Sanger pledged that Byrne would never break the law was she pardoned after ten days. Sanger was convicted; the trial judge held that women did not have "the right to copulate with a feeling of security that there will be no resulting conception." Sanger was offered a more lenient sentence if she promised to not break the law again, but she replied: "I cannot respect the law as it exists today." For this, she was sentenced to 30 days in a workhouse. An initial appeal was rejected, but in a subsequent court proceeding in 1918, the birth control movement won a victory when Judge Frederick E. Crane of the New York Court of Appeals issued a ruling which allowed doctors to prescribe contraception. The publicity surrounding Sanger's arrest, trial, and appeal sparked birth control activism across the United States and earned the support of numerous donors, who would provide her with funding and support for future endeavors.  In February 1917, Sanger began publishing the monthly periodical Birth Control Review.
Margaret Sanger