A People's Calendar (aPC) is an open-source project that seeks to promote the worldwide history of working class movements and liberation struggles in the form of a searchable "On This Day" style calendar.
Max Nettlau, born on this day in 1865, was an anarchist historian whose biographical subjects included Bakunin, Malatesta, and Élisée Reclus. His enormous collection of primary materials is held by the International Institute of Social History.
Image: A 1928 photo portrait of Max Nettlau [Wikipedia]