A Northern California man considered by the federal government to be a radical eco-terrorist and a threat to the nation has been set free amid claims the FBI hid evidence.

The Sacramento Bee reports (http://bit.ly/1xZlmOA ) that in 2007, Eric Taylor McDavid was convicted of plotting to bomb or torch the Nimbus Dam, a U.S. Forest Service lab and cellphone towers in the Sacramento region.

He was sentenced to nearly 20 years in federal prison in a case touted by the FBI as a success in fighting domestic terrorism. He served nine years and agreed Thursday to plead guilty to one conspiracy count that would have originally earned him a much lesser sentence.

The government conceded that thousands of pages of evidence that should have been given to McDavid's attorney had been secretly held in an FBI file until recently.