Sentence:  For a long time, <WSD>libertarian</WSD> was interchangeable in France with anarchist but in recent years, its meaning has become more ambivalent. Some anarchists like David Guérin will call themselves 'libertarian socialists', partly to avoid the negative overtones still associated with anarchism, and partly to stress the place of anarchism with the socialist tradition. Even Marxists of the New Left like E. P. Thompson call themselves <WSD>'libertarian</WSD>' to distinguish themselves from those authoritarian socialists and communists who believe in revolutionary dictatorship and vanguard parties. 
Meaning of the word marked with <WSD> tags:  A left-libertarian, an antiauthoritarian believer in both individual freedom and social justice (social equality and (mutual aid)), such as a social anarchist.