(1921 - 1997) ~ Brazilian Educator, Philosopher, Leading Advocate of Critical Pedagogy, and Author of "Pedagogy of the Oppressed" : A Brazilian educator and philosopher who was a leading advocate of critical pedagogy. His influential work Pedagogy of the Oppressed is generally considered one of the foundational texts of the critical pedagogy movement, and was the third most cited book in the social sciences as of 2016 according to Google Scholar. (From : Wikipedia.org.)

(1814 - 1876) ~ Grandfather of Social Anarchism, the First Anti-Marxist, Theorist of Collective-Anarchism : Russian revolutionary anarchist, socialist and founder of collectivist anarchism. He is considered among the most influential figures of anarchism and a major founder of the revolutionary socialist and social anarchist tradition. Bakunin's prestige as a revolutionary also made him one of the most famous ideologues in Europe, gaining substantial influence among radicals throughout Russia and Europe. (From : Wikipedia.org.)

Early 19th-Century Physician, Women's Rights Advocate, and Reproductive Liberty Activist

(1894 - 1963) ~ English Writer, Philosopher, Pacifist, Universalist, Mysticist : ...an English writer and philosopher. He wrote nearly 50 books,[5][6] both novels and non-fiction works, as well as wide-ranging essays, narratives, and poems. Born into the prominent Huxley family, he graduated from Balliol College, Oxford, with an undergraduate degree in English literature. Early in his career, he published short stories and poetry and edited the literary magazine Oxford Poetry, before going on to publish travel writing, satire, and screenplays. (From : Wikipedia.org.)

(1561 - 1636) ~ Austrian Jesuit Astronomer, Student, Scholar, Astronomer, Professor of Mathematics, Namesake of the Crater Gruemberger on the Moon : An Austrian Jesuit astronomer, after whom the crater Gruemberger on the Moon is named. (From : Wikipedia.org.)

"Life in English Prisons (100 Years Ago): Mysteries of Scotland Yard -- Startling Revelations," by David Nicoll, 1895, reprinted by the Kate Sharpley Library, 1992.

"The Labour Party Muddle," by John Maclean, 1910.

"Prudence or Prudery in Sex Matters," by Margaret Sanger, [23 Aug 1919]. Source: Fairplay, [Aug. 23, 1919] , Margaret Sanger Microfilm C19:0129.

"The Purloined Letter," by Edgar Allen Poe, the Gift for 1845, published 1844.

"Unknown Heroes: Biographies of Anarchist Resistance Fighters," by Miguel Garc?a, published by the Kate Sharpley Library, 2005.