Generate text that refutes this claim: It may be necessary in the interests of national security  The Government must protect its citizens from foreign enemies and internal enemies - thus freedom of speech can be acceptably curtailed during times of war in order to prevent propaganda and spying which might undermine the national interest. This has happened in almost all states during times of war, during the second world war the United States even had a government department dedicated to it; The Office of Censorship. [1]  [1] Hanyok, Robert J., ‘Secrets of Victory: The Office of Censorship and The American Press and Radio in World War II’, Studies in Intelligence, Vol 46, No. 3,
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The ends do not justify the means. The government may well wish to suppress publication of information that would be prejudicial to its success in the next elections or its war campaign, but it’s in the public interest to know about their dirty dealings or illegal activities.  Moreover secrecy in the name of security often leads to injustice; the rendition of British residents and secret evidence given at control order hearings are but a couple of examples.