Sectarianism in Europe is an unwanted social phenomenon caused by deep-rooted historical antipathies between communities separated by religion and/or national allegiance. In Scotland, following its 16thcentury Protestant Reformation, Catholicism declined until it wasforcibly suppressed after the defeat of Bonnie Prince Charlie's Jacobites at Culloden in 1715. In the 19th century, beginning after the Great Famine in Ireland, and continuing with the rise to worldpre-eminence in ship building and allied heavy industry of Glasgow, a large influx of Catholic Irish workers arrived in the west of Scotland, reawakening sectarianism. This tension exists today, most visibly in the 'Old Firm' (OF) rivalry between Glasgow Celtic and Glasgow Rangers, th...