Sports fans who call themselves the "Yid Army" have been warned they face potential criminal prosecution amid a crackdown by soccer chiefs that has triggered debate in Britain about whether the so-called "Y" word is acceptable. Long-simmering controversy over whether supporters of London's Tottenham Hotspur Football Club -- known as Spurs -- should be permitted to chant the word "Yid" during games exploded when authorities warned that chanting the term could result in fans being fined up to $1600 and being banned from stadiums across the U.K. and abroad.