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In page Intelligence Identities Protection Act:

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The law was written, in part, as a response to several incidents where Central Intelligence Agency (CIA) agents or officers' identities were revealed. Under then existing law, such disclosures were legal when they did not involve the release of classified information. In 1975, CIA Athens station chief Richard Welch[1] was assassinated by the Greek urban guerrilla group November 17 after his identity was revealed in several listings by a magazine called CounterSpy, edited by Timothy Butz. A local paper checked with CounterSpy to confirm his identity.[2] However, the linkage between the publication of Welch's name and his assassination has been challenged by pundits that claim he was residing in a known CIA residency.[3]