article_snippet.sent: Much of the football violence that breaks out in or near Brazilian stadiums is traced to fan clubs.
article_snippet.sent: Police often investigate fan groups for ties with drug traffickers.
article_snippet.sent: It is widely known that criminal organisations are inside of all fan clubs.
article_snippet.sent: Organised crime uses these fan groups as a front for these fan groups misdeeds,' Juca Kfouri, one of Brazil's best-known sports commentators, told radio station CBN.