While the term "libertarian" has been largely synonymous with anarchism, its meaning has more recently diluted with wider adoption from ideologically disparate groups, including both the New Left and libertarian Marxists (who do not associate themselves with authoritarian socialists or a vanguard party) as well as extreme liberals (primarily concerned with civil liberties). Additionally, some anarchists use "libertarian socialist" to avoid anarchism's negative connotations and emphasise its connections with socialism. Matthew S. Adams and Carl Levy write that "anarchism" is used to "describe the anti-authoritarian wing of the socialist movement." Noam Chomsky describes anarchism, alongside libertarian Marxism, as "the libertarian wing of socialism." Daniel Guérin wrote: