Though he is known as "the prince anarchist" I love his book Mutual Aid: A Factor of Evolution, writen against social Darwinism and the so called "Struggle for Existence"

Alice Hamilton, Exploring the Dangerous Trades (1943)

"Prince Peter Kropotkin was one of the most lovable persons I have ever met. He was a typical revolutionist of the early Russian type, an aristocrat who threw himself into the movement for emancipation of the masses out of a passionate love for his fellow man, and a longing for justice.

He stayed some time with us at Hull House, and we all came to love him, not only we who lived under the same roof but the crowds of Russian refugees who came to see him. No matter how down-and-out, how squalid even, a caller would be., Prince Kropotkin would give him a joyful welcome and kiss him on both cheeks.

It was most unfortunate that his visit to us came just a short time before the assassination of President McKinley. That event woke up the dormant terror of anarchists which always lay close under the surface of Chicago's thinking and feeling, ever since the Haymarket riot. It was known that Czolgosz, the assassin, had been in Chicago at the time when both Emma Goldman and Kropotkin were there, and a rumor started that he had met them and the plot had been of their making - Czolgosz had been their tool. Then the story came to involve Hull House, which had been the scene of these secret, murderous meetings. "