Steve Dennis "Clem" Grogan (born May 24, 1952), is an American murderer, former member of The Manson Family. He is the only Manson Family member to be released from prison among those who were convicted of murder.

Musically, Grogan was a proficient guitarist and serviceable singer. Grogan was one of the primary musicians in the recordings known as "The Family Jams", recorded in 1970 with other Manson Family members.

While in prison, he jammed with fellow ex-Mansonite Bobby Beausoleil on one occasion in 1978, and performed in a prison band several times the same year. Recordings of these shows appear sporadically on YouTube.

After his parole in 1985, Grogan continued to play music, appearing under an alias, "Adam Gabriel" in the semi-professional roots-rock band Rhythmtown Jive in the early 2000's. He has claimed to have worked with The Christmas Jug Band; Rex Bell and OrestesVilato; Those Darn Accordions, and Dan Hicks

While only "The Family Jams" has been released on record (on a small, Family-related independent imprint), tapes of Grogan's 1978 performances have circulated among Mansonophiles, 60's aracana buffs, outsider music devotees, and other fringe listeners.