Portal:Anarchism/Anniversaries/September/September 21
- 1881 – Swiss anarchist, artist and scholar Ernst Frick (1881 – 1956) is born
- 1921 – Russian individualist anarchist insurrectionist Lev Chernyi (pictured) is executed without trial by the Cheka
- 1923 – Emma Goldman and Alexander Berkman are joined in Berlin by Mollie Steimer and Senya Fleshin after their deportation from Russia where they had been imprisoned for anarchist activism
- 1970 – The Wimbledon Conservative Association in London is firebombed; the attack is one of many attributed to the The Angry Brigade and similar anarchist militant groups in England and France during the year