The Irish journalist Ed Moloney wrote in the Nieman Reports of Hardvard University here. He started with a brief historical sweep:
"Censorship has a long if not very honorable place in Irish history. The British imposed press controls during the 1919-21 war of independence, as did the pro-Treaty side in the subsequent Irish civil war. Newspapers were forbidden, for instance, to use words like “guerilla” to describe opponents of the new Irish government. Censorship lived on after the early Troubles. In the south of Ireland it took a less political and more religious form. The state censor was allowed to ban books and films on moral grounds, i.e. when they offended Catholic doctrine or values.
In Northern Ireland censorship remained entirely political. In the 1920’s the pro-British Unionist government passed the Special Powers Act, a draconian piece of legislation which gave the police the authority to ban any dubious expression of political thinking and to imprison those responsible.