202 BRITISH INSTITUTIONS OF TO-DAY works of charity. The other point is simply this: a clash of loyalties is always distressing and may be disastrous to individual or community, but without the freedom which makes that clash at any moment possible no State however strong can provide a home for free citizens. §3. THE NEED FOR TOLERATION What we have been saying about churches and trade unions may remind us that persecution in the interests of a dominant class was formerly a regular function of the State. Little more than a hundred years ago trade unionists were persecuted in the interests of employers, while Catholics and Protestant Nonconformists were subjected to various mortifying disabilities, involving exclusion from the ancient universities and from any full participation in political life, in the supposed interests of the Church of England. Besides these special cases of intolerance, there was once the more general principle of discouraging all criticism of the Government, emancipation from which provides the theme for a large part of English con- stitutional history, especially on the legal side. Since 1679, when the Habeas Corpus writ was made an effective safeguard against arbitrary imprisonment by Government orders, successive battles have been waged over such matters as the right to petition the Crown, freedom from arbitrarily issued warrants foi search and arrest, the publication of parliamentary debates, and the all-important general liberty to criticize all Government actions without let 01 hindrance. Writing half a century ago, the late Professor Dicey