There have been a number of nuclear whistleblowers, often nuclear engineers, who have identified safety concerns about nuclear power and nuclear weapons production. In 1976 Gregory Minor, Richard Hubbard and Dale Bridenbaugh "blew the whistle" on safety problems at nuclear power plants in the United States. George Galatis was a senior nuclear engineer who reported safety problems at the Millstone 1 Nuclear Power Plant, relating to reactor refueling procedures, in 1996. Other nuclear power whistleblowers include Arnold Gundersen and David Lochbaum.
The first prominent nuclear whistleblower was Karen Silkwood, who worked as a chemical technician at a Kerr-McGee nuclear fuel plant. Silkwood became an activist in the Oil, Chemical and Atomic Workers International Union in order to protest health and safety issues. In 1974, she testified to the United States Atomic Energy Commission about her concerns. A few months later she died in a car crash under mysterious conditions on the way to a meeting with a New York Times reporter and a national union leader. The 1983 film Silkwood is an account of this story.
On February 2, 1976, Gregory C. Minor, Richard B. Hubbard, and Dale G. Bridenbaugh (known as the GE Three) "blew the whistle" on safety problems at nuclear power plants, and their action has been called "an exemplary instance of whistleblowing".