The FBI arrested Nathan Brasfield on Tuesday after searching his Lake Forest Park home and finding a rifle suspected of being modified as an illegal machine gun.
The seattlepi.com reports animal rights activists called Brasfield a political prisoner in 2003 after he was convicted of breaking into a phone line to send faxes to a former executive of a firm that tested drugs on animals. He also was convicted of possessing stolen property in 2011.
If convicted of federal gun charges, the 35-year-old faces up to a decade in prison.
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