...é interessante lembrar dum caso canadense de 1937:
The Accurate News and Information Act was a statute passed by the Legislative Assembly of Alberta, Canada, in 1937, at the instigation of William Aberhart's Social Credit government. It would have required newspapers to print "clarifications" of stories that a committee of Social Credit legislators deemed inaccurate, and to reveal their sources on demand.
The act was a result of the stormy relationship between Aberhart and the press, which dated to before the 1935 election, in the Social Credit League was elected to government. Virtually all of Alberta's newspapers—especially the Calgary Herald—were critical of Social Credit, as were a number of publications from elsewhere in Canada. Even the American media had greeted Aberhart's election with derision.
Though the act won easy passage through the Social Credit-dominated legislature, Lieutenant-Governor of Alberta John C. Bowen reserved royal assent until the Supreme Court of Canada evaluated the act's legality. In 1938's Reference re Alberta Statutes, the court found that it was unconstitutional, and it was never signed into law.