Harley Francis Flanagan is an American musician. He is currently the bassist, vocalist and sole remaining founding member of 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, helping to found the Cro-Mags in 1981 and Murphy's Law in 1982.