Millwall have averaged a gate close to 12,000 per home game over their 93 seasons in the Football League, while the club have spent the majority of that time yo-yoing back and forth between the second and third tiers of English football. Originally based in the East End of London, the club moved across the River Thames in 1910 to south east London and support is drawn from the surrounding areas. The club and fans have a historic association with football hooliganism, which came to prevalence in the 1970s and 1980s with a firm known originally as F-Troop, eventually becoming more widely known as the Millwall Bushwackers, who were one of the most notorious hooligan gangs in England. On five occasions The Den was closed by The FA and the club has received numerous fines for crowd disorder. The BBC documentary "Panorama" was invited into the club by Millwall in 1977 to show the hooligan reputation was a myth and being blown out of proportion by reporting. Instead the BBC portrayed hooliganism as being deeply rooted in Millwall, and attempted to link them to the far-right political party National Front. The show was extremely damaging for the club. Former club chairman Reg Burr once commented: "Millwall are a convenient coat peg for football to hang its social ills on", an example being the reporting of convicted murderer Gavin Grant. Although he had played for eight different clubs, playing his fewest games (four) for Millwall, and was signed to Bradford City at the time, the BBC used the headline, "Former Millwall striker Gavin Grant guilty of murder".