The Revolutionary Communist Vanguard was a Far Left group in the United States. It broke off from the Philadelphia section of the Revolutionary Workers League. Originally known as the "Social Science Circle", it became the Revolutionary Communist Vanguard when the group made its final break with Hugo Oehler. It was "led by a lad named Fleming" and, according to Max Shachtman, had a membership of only 2 people in December 1938. The member or members of the group used a variety of inventive pseudonyms in their bulletins, i.e., Don Quickshot, Obadiah Fairfax, Robin Redbreast, Jerome Rembrandt, and Esther Paris.