The 2016 arrest of a former National Security Agency contractor charged with a massive theft of classified data began with an unlikely source: a tip from a Russian cybersecurity firm that the U.S. government has called a threat to the country. Moscow-based Kaspersky Lab turned Harold T. Martin III in to the NSA after receiving strange Twitter messages in 2016 from an account linked to him, according to two people with knowledge of the investigation.
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