"Darwin’s publication of On the Origin of Species sparked major battles. The most famous may have been between science and religion, but there were disputes within science as well. One of the most heated was whether natural selection favored cooperative or competitive behaviors, a battle that still rages today. For almost 100 years, no single person did more to promote the study of the evolution of cooperation than Peter Kropotkin.
Kropotkin traveled the world talking about the evolution of cooperation, which he called “mutual aid,” in both animals and humans."
Via Howard Rheingold