Many of the most shocking incidents in British football history have involved the hooligan followers of one club: Leeds United. For 40 years they have run riot across the country, punching their way to international notoriety - yet they have remained the most secretive of all mobs. Journalist Caroline Gall spent two years interviewing participants from several generations to piece together the first ever history of the gangs, from the Shipley Skins to the youths of the present day. Service Crew is the definitive story of football's most vilified fans.