This volume examines closely ways in which other intelligence services have made use of the IRS as a lending library of tax information. This great storehouse of data on American citizens have proved to be irresistibly tantalizing to other Federal agencies, particularly the FBI. The controls over the use of tax information which the IRS releases to other agencies were found to be inadequate. The committee found evidence indicating that the FBI had widely misused IRS tax information to disrupt political activists. Tax return confidentiality had eroded to the point where the Federal Government had turned these supposedly private documents into instruments of harassment used against citizens for political reasons.