"socialism" . . "Proto-socialism" . . "many political movements throughout history" . . . . "socialist" . . "history of socialism" . . "history of socialist thought" . "history of socialist doctrines" . . . "classical socialism" . "History of socialism" . "History of Socialism" . "socialist tradition" . "socialist history" . "Socialism, History of" . "Socialist" . "Socialists" . . "History of socialism" . "socialist movement" .