The Vanguard Group was an anarchist political group active during the 1930s, which published the periodical Vanguard: Journal of Libertarian Communism, led by Sam Dolgoff (aka Sam Weiner, editor of Vanguard).
Vanguard was for a time during the 1930s the only English language anarchist organization in New York City to carry out an active existence.
References
Vanguard Group (anarchist) Wikipedia(Text) CC BY-SA