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In page Freedom of speech by country:

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Historically, local communities and governments have sometimes sought to place limits upon speech that was deemed subversive or unpopular. There was a significant struggle for the right to free speech on the campus of the University of California at Berkeley in the 1960s. And, in the period from 1906 to 1916, the Industrial Workers of the World, a working class union, found it necessary to engage in free speech fights intended to secure the right of union organizers to speak freely to wage workers. These free speech campaigns were sometimes quite successful, although participants often put themselves at great risk.[citation needed]