Prince Peter Alexeivitch Kropotkin, revolutionary and scientist, was descended from the old Russian nobility, but decided, at the age of thirty, to throw in his lot with the social rebels not only of his own country, but of the entire world. He became the intellectual leader of Anarchist-Communism; took part in the labor movement; wrote many books and pamphlets; established Le RÉvoltÉ in Geneva and Freedom in London; contributed to the Encyclopedia Britannica; was twice imprisoned because of his radical activities; and twice visited America. After the Bolshevist revolution he returned to Russia, kept himself apart from Soviet activities, and died true to his ideals.