There are more than one band with the name 'No Authority':
These are photos from concerts where No Authority played, so they may be of other bands that played the concert as well.
Sister 2 Sister / Angela Via / Nick Cannon / No Authority / B*Witched / LFO Aug 12, 2000 Wallingford, Connecticut, United States Uploaded by Concertkatie
Britney Spears / No Authority / BBMak / Innosense Jun 21, 2000 Hartford, Connecticut, United States Uploaded by Concertkatie