The FBI leakers

Circa:

Declassified memos show FBI illegally shared spy data on Americans with private parties

The FBI has illegally shared raw intelligence about Americans with unauthorized third parties and violated other constitutional privacy protections, according to newly declassified government documents that undercut the bureau’s public assurances about how carefully it handles warrantless spy data to avoid abuses or leaks.
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For instance, a ruling declassified this month by the Foreign Intelligence Surveillance Court (FISA) chronicles nearly 10 pages listing hundreds of violations of the FBI’s privacy-protecting minimization rules that occurred on Comey’s watch.

The behavior the FBI admitted to a FISA judge just last month ranged from illegally sharing raw intelligence with unauthorized third parties to accessing intercepted attorney-client privileged communications without proper oversight the bureau promised was in place years ago.
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There is much more.

I suspect that this may be one of the reasons the FBI has not been aggressive at stopping leaks of classified materials.  They appear to be the leakers.