Harley Francis Flanagan is an American musician, known for being the bassist and vocalist of the hardcore punk band the Cro-Mags. Flanagan began his musical career at age 11 in 1978, drumming for the New York punk band the Stimulators alongside his aunt Denise Mercedes. By the early 1980s, he was a prominent figure in the developing New York hardcore scene, helping to found the Cro-Mags in 1981 and Murphy's Law in 1982. Although technically he has not remained a constant member of Cro-Mags, having left and rejoined the band on a few occasions, Flanagan is the only member to appear on all of their studio albums.