 This was the first wide exposure of the NSA, which had for decades prevented public knowledge of its abilities and activities.The revelations led the U.S. Senate Church Committee to introduce successful legislation intended to stop the NSA spying on American citizens.In December 2005 Russ Tice helped spark a national controversy over claims that the NSA and the Defense Intelligence Agency (DIA) were engaged in unlawful and unconstitutional wiretaps on American citizens.