A California man was charged Thursday with threatening to shoot and kill Boston Globe journalists, calling them “the enemy of the people,’’ in response to the newspaper’s nationwide editorial campaign denouncing President Trump’s political attacks against the press.

Robert Darrell Chain, 68, was arrested at dawn in his home in Encino, Calif., by an FBI SWAT team armed with military-style weapons and what neighbors believe were flash-bang grenades. Authorities said they found 20 firearms in the home, including a semiautomatic rifle purchased in May.

Chain made a brief appearance Thursday afternoon in a federal court in Los Angeles. He was released on $50,000 bond, and is slated to appear in a federal court in Boston on Sept. 24 to face a single charge of making a threatening communication in interstate commerce. He faces up to five years in prison and a $250,000 fine. It was not immediately clear if he would face additional charges related to the weapons.

Investigators were seen in the Encino neighborhood of Los Angeles at the home of Robert Darrell Chain, who allegedly threatened to kill Boston Globe employees. —Matt Sayles for The Boston Globe