Aldrich served in the FBI for 26 years and was assigned to the White House bracketing the Reagan and Clinton Administrations. In his White House post, he was the responsible for background checks for positions including White House Counsel, Chief of Staff, Secretary of State, Attorney General, FBI Director, and other cabinet posts. Prior to his White House assignment, Aldrich held liaison positions in both the U.S. House of Representatives and the U.S. Senate. From 1969–1986, he served as FBI Special Agent Investigator in Austin, Los Angeles, Miami, and Washington, D.C.
In 1997, Aldrich formed a nonprofit organization, The Patrick Henry Center for Individual Liberty, to support other federal level whistle-blowers; the group's stated aim is "promoting the U.S. Constitution and Bill of Rights and supporting the right of citizens to engage in ethical dissent." His first client was Linda Tripp, the White House staff member who reported the extramarital affair between Bill Clinton and Monica Lewinsky in 1998. The Patrick Henry Center has since supported numerous whistle-blowers reporting fraud and abuse in government. The Center additionally promotes limited government, individual liberty, and constitutional rule of law. In 2014, the 501(c)3 status of PHCIL was revoked by the IRS on the basis that it had "operated as an action organization because you participated in or intervened in political campaigns on behalf of and in opposition to candidates for public office".
Aldrich's other books are Speak No Evil (a novel, 1998) and Thunder on the Left: An Insider's Report on the Hijacking of the Democratic Party in 2003. He now writes for conservative publications including WorldNetDaily (weekly) and Townhall.com (bi-weekly).