Which Court case established limited protections afforded to journalists known as "Shield Laws"?

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Branzburg v. Hayes (1972) is the landmark Supreme Court case that addressed the issue of whether journalists have a First Amendment right to refuse to reveal their sources in front of a grand jury. The Court ruled that the First Amendment does not exempt journalists from testifying before grand juries, leading to the development of "Shield Laws" at the state level to offer some protections.

Which Court Case Established Limited Protections Afforded to Journalists Known