The legal definition of media censorship is the proscribing of speech, broadcast or writing held to be indecent, controversial or obscene. This is forbidden under the First Amendment of the Constitution in the United States, which specifically protects freedom of speech and freedom of the press. Though against the law, informally it still happens. 

The reasons for censorship are various, including if the story is deemed obscene, objectionable, sensitive or inconvenient. The authorities making the decision to censor can be government, corporate or other groups. Political fallout can influence media outlets from reporting information that government officials don't want made public. Business decision can influence what makes it to broadcast or print. 

In history, there are examples of attempted government censorship. In 1971, for example,  The New York Times published the Pentagon Papers, highly secret government documents that outlined the history of American involvement in Southeast Asia and the Vietnam War.

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