FAS

The Case of Matthew Diaz

04.07.08 | 2 min read | Text by Steven Aftergood

Last year, U.S. Navy Lt. Cmdr. Matthew Diaz was convicted of unlawfully disclosing classified information to an unauthorized person, after he provided the names of prisoners secretly held in military detention at Guantanamo Bay to a civil rights organization. He was sentenced to six months in prison and ordered discharged from the Navy.

Last week, Diaz was honored as a “truth teller” at the National Press Club in Washington, DC for the very same action.

He received the Ridenhour Award, named for the late Ron Ridenhour, who revealed the 1968 massacre of Vietnamese at My Lai.

“Lt. Cmdr. Diaz demonstrated independent judgment, fidelity to the Constitution, and uncommon courage,” according to the Ridenhour Award statement. “By disclosing the names of prisoners secretly detained at Guantanamo, he broke ranks and he violated the law, and for that he has paid a serious price. But we believe that he also demonstrated a profound loyalty to the United States and its enduring constitutional principles.”

The April 3 remarks of Matthew Diaz upon receiving the Ridenhour Award may be found here.

The award ceremony and some of the background to it were described by Joe Conason in “A Truth Teller Who Deserves Justice,” Salon.com, April 4.

A longer treatment of the Diaz case appeared in “Naming Names at Gitmo” by Tim Golden, New York Times Magazine, October 21, 2007.

Remarkably, Diaz appears to be the first American ever convicted under the espionage statutes for disclosing classified information to another American rather than to a foreign person or government, according to a new study of espionage in America.

publications
See all publications
Emerging Technology
day one project
Policy Memo
Securing Cell-Free Biomanufacturing as a Strategic National Capability

DNA synthesis and export controls remain the primary regulatory safeguards against de novo production of harmful biological agents, yet governance frameworks lack the situational awareness and enforcement capacity to keep pace with rapidly falling technical barriers.

07.02.26 | 11 min read
read more
FAS
Press release
Dr. Jedidah Isler, Chief Science Officer of the Federation of American Scientists, Testifying on “American Global Competitiveness” in Congressional Committee Today

Called today to speak on behalf of U.S. science and technology, Dr. Jedidah Isler, astrophysicist, educator, strategist, policy-maker, and science communicator, will provide constructive, nonpartisan feedback to the House Committee’s hearing “American Global Competitiveness at 250: Legislative Proposals to Secure U.S. Technology Leadership.”

06.30.26 | 4 min read
read more
Government Capacity
Press release
Federation of American Scientists Launches Data Policy Institute to Advance Federal Data Essential to the Public

“Federal data and access to it is not a partisan issue. It is a people issue. Our country cannot achieve greatness without access to the data that measure what we value, who we are, and where we’re heading.”

06.30.26 | 4 min read
read more
Global Risk
Issue Brief
Transforming American Biosecurity

The United States’ biosecurity governance system is structurally incapable of detecting and responding to certain classes of threats. U.S. biosecurity tools have not kept pace with technological advancements or a changing threat landscape.

06.29.26 | 8 min read
read more