"football fans" . "rowdiest fans" . "active support" . "ultras supporters" . "fanatical fans" . "Organized groups" . "active supporters" . . "ardent supporters" . "Ultras group" . "European ultras" . "fierce devotion" . "ultras" . "ultras group" . "organised fan movement" . "avowed supporter" . "supporters' culture" . "ultra groups" . . "Bayernultras" . "active fans" . "Ultras" . "ultra fan group" . "ultras groups" . "organized Ultras group" . "football hooligan" . "ultra" . "ultras fan group" . "fan groups" . "hooligan" . "ultra fans" . "Ultras groups" . . "fan movement" . "elements from soccer fandom" . "Ultras" . "ultra football fans" . "culture" . . . . "ultras organization" . . "ultra group" . "Ultra" . .