A federal grand jury in Boston has indicted a California man who was previously arrested and charged with making violent threats against employees of The Boston Globe.

Robert Chain, 68, of Encino, Calif., was indicted on seven counts of using "interstate and foreign commerce to transmit a threat to injury another person," the Department of Justice said on Tuesday. He received one count for each of the seven threatening phone calls he is accused of making to the Globe's newsroom.

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Authorities said Chain began making his threats immediately after the Globe led an effort with other newspapers to publish editorials condemning President Trump's attacks against the press. Chain was arrested and charged last month.

Chain called the Globe's newsroom the day its editorial was published and threatened to shoot employees in the head "later today, at 4 o’clock,” according to authorities. During his calls, he also referred to the newspaper's employees as the "enemy of the people," a phrase that Trump has often used to describe the press.

In its Aug. 15 editorial, the Globe said that calling the press "the enemy of the people" is "un-American."

“To label the press ‘the enemy of the people’ is as un-American as it is dangerous to the civic compact we have shared for more than two centuries," the Globe wrote.

More than 300 news organizations pledged to join the effort and publish their own editorials.

Trump responded to the editorials by accusing the Globe of "collusion with other papers."

"The Boston Globe, which was sold to the the Failing New York Times for 1.3 BILLION DOLLARS (plus 800 million dollars in losses & investment), or 2.1 BILLION DOLLARS, was then sold by the Times for 1 DOLLAR. Now the Globe is in COLLUSION with other papers on free press. PROVE IT!" Trump wrote in a tweet at the time.

Chain, who faces up to five years in prison, is scheduled to appear in federal court in Boston next week.