Posted on November 16, 2011November 16, 2011 by HardlineEntAuthority Zero Added to Groezrock!Groezrock has finally announced it’s line up for April 22nd and 23rd and Hardline is proud to announce Authority Zero will be joining this amazing festival. Catch them with Rancid, Lagwagon, NOFX and more!Click here for the full line up and all information!