The Retching Pigs
From the "Rock Zombies" issue of Marvel comic book The Runaways (Runaways #7-#9, February 2009 - April 2009). Written by Terry Moore.
Band dropped by their label via email. This irks them somewhat, so they hold the offending record company flunky hostage on the roof of the record company building with machine guns. Superheroes intervene.