Treasury Inspector General for Taxpayer Administration (TIGTA)

See the following -

IRS Illegally Gave Taxpayer Data To The FBI In 2010, Republicans Say

Aliya Sternstein | Nextgov.com | June 9, 2014

The IRS sent the FBI a huge database containing sensitive taxpayer information on nonprofit conservative groups, possibly in violation of federal law, House Republicans allege. The lawmakers claim the transfer was part of an intentional effort to potentially probe the organizations for illegal campaign activities...

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