Margaret Sanger
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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.
This page from Sanger's Family Limitation, 1917 edition, describes a cervical cap.
Sanger published the Birth Control Review from 1917 to 1929.
W. E. B. Du Bois served on the board of Sanger's Harlem clinic.
Anarchist symbolism
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Anarchists have employed certain symbols for their cause, including most prominently the circle-A and the black flag. Anarchist cultural symbols have been prevalent in popular culture since around the turn of the 21st century, concurrent with the anti-globalization movement. The punk subculture has also had a close association with anarchist symbolism.
Red-and-black bisected flags at an anti-austerity march in London, 2011
Graffiti with the slogan "NO GODS, NO MASTERS" and the anarchist "A" symbol on a concrete wall in the central bus station of Munich, Germany, in 2022
An IWW stickerette or silent agitator