The Inns of Court in London are the professional associations to one of which every English barrister (and those judges who were formerly barristers) must belong. They have supervisory and disciplinary functions over their members. The Inns also provide libraries, dining facilities and professional accommodation. Each also has a church or chapel attached to it and is a self-contained precinct where barristers traditionally train and practise, although growth in the profession caused many barristers' chambers to move outside the precincts of the Inns of Court in the late 20th century.