Five government whistleblowers said Tuesday they had faced retaliation for calling attention to alleged government wrongs. They told their stories to the House Government Reform Committee's national security subcommittee, whose chairman, Rep. Chris Shays, R-Conn., indicated an interest in altering the law to better protect national-security whistleblowers. Army Spc. Samuel Provance laid out what he considers to be a pattern of systemic abuses at Iraq's Abu Ghraib prison. He said his rank was reduced for disobeying orders not to speak about mistreatment he saw at the prison. Russ Tice, a former NSA analyst, has called attention to possible constitutional abuses and security breaches at NSA. He said he was given psychological evaluations deeming him mentally unstable, and his clearance was revoked. He's now unemployed. Lt. Col. Anthony Shaffer says the Defense Intelligence Agency has made a series of allegations against him since he disclosed information about a program known as Able Danger. He says the program identified four Sept. 11 hijackers before the attack. Richard Levernier, a retired Energy Department nuclear security specialist, said he lost his security clearance and effectively his job for giving the media an unclassified report about shortfalls in nuclear security.