West London derby been in the Football League for a longer period of time than Brentford and had stronger rivalries with the likes of West Ham United and Tottenham Hotspur, whereas Brentford's main rivals are Fulham and QPR. Also Brentford developed a bigger sporting rivalry with Arsenal at the time as both clubs vied for the title of London's number one club. The only bad feeling between the clubs was soon after Chelsea's foundation and admission into the Football League in 1905, the other West London clubs, including Brentford, lost many supporters and potential supporters to the only professional Football League club in
Supporters' groups affiliated club, recognised on the club's website and holds meetings at the stadium. In England and Wales nearly all official supporter groups are affiliated with the Football Supporters' Federation. Also In England and Wales only, Supporters Direct are an umbrella organisation promoting fan-ownership. There are also numerous hooligan firms in Britain, also known as casuals in itself a style of support and sub-culture, stemming largely from the fact that Britain is the birthplace of the phenomenon of football hooliganism. In the Republic of Ireland the supporters embrace a mixture of both ultra and casual styles. The major supporters' group for