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What we know so far: Hackers have leaked login records for more than 41,000 Department of Homeland Security employees and contractors, revealing not only who works at the agency but also which surveillance and investigative tools they are cleared to use. Taken together, the files offer a rare inside look at the technology behind the department's investigations and the chain of command that directs them. The release also sharpens the debate over whether exposing the people behind federal immigration enforcement serves accountability or creates a security threat.

The transparency nonprofit Distributed Denial of Secrets published the archive, which it calls "Icepick," on Wednesday.…