Voltairine de Cleyre's political perspective shifted throughout her life, eventually leading her to become an outspoken proponent of "anarchism without adjectives <http://en.wikipedia.org/wiki/Anarchism_w.....adjectives>," a doctrine, according to historian George Richard Esenwein, "without any qualifying labels such as communist <http://en.wikipedia.org/wiki/Anarchist_communism>, collectivist <http://en.wikipedia.org/wiki/Collectivism>, mutualist <http://en.wikipedia.org/wiki/Mutualism_%....._theory%29>, or individualist <http://en.wikipedia.org/wiki/Individualist_anarchism>. For others, … [it] was simply understood as an attitude that tolerated the coexistence of different anarchist schools."[9] <http://en.wikipedia.org/wiki/Voltairine_.....ite_note-8>