Association football is the richest, most popular sport in history with a multicultural global following encompassing all religions. It is also riven with corruption, racism, homophobia and a violence that has for decades resisted all attempts to tame it. It is this Janus-faced quality that makes football so thrilling. Countless books have focused on the visibly glamorous, wholesome and admirable aspects of the sport. Cashmore and Cleland, by contrast,...