Federal prosecutors announced charges Monday against two people associated with ‘Terrorgram,’ an online network of white supremacists that encouraged attacks on Black, gay and immigrant targets, as well as assassinations of high-ranking American officials.

Authorities said Dallas Erin Humber and Matthew Robert Allison promoted “the collapse of government and the rise of a white ethno-state” and had a global reach, inspiring attacks in Turkey and Slovakia as well as in the U.S.

They used Telegram, a messaging app, to spread “target” lists, complete with addresses, and they disseminated how-to videos and manuals for making letter bombs and “dirty bombs” that mixed conventional explosives with radioactive material, according to the federal indictment.

Authorities said the two radicalized followers on social media, encouraging them to strive for “sainthood” through vicious hate-fueled attacks that would make them “heroes of the white race.”

“It would be difficult to overstate the danger and risks that his group posed,” said Matt Olsen, assistant attorney general for national security. “Their reach is as far as the internet.”

Ms. Humber has her first court appearance scheduled for later Monday. Mr. Allison is scheduled for Tuesday.

No lawyers were listed for them as of early Monday afternoon.

They were charged in a 15-count indictment handed up by a grand jury in eastern California late last week that includes accusations of solicitation of murder, solicitation of hate crimes, making threats, distributing information about explosives and conspiracy to provide material support to terrorists.

Authorities said the two defendants inspired an attempted attack on an electrical substation in New Jersey earlier this summer. An undercover FBI agent thwarted the plans.

Prosecutors also said Terrorgram inspired a live-streamed stabbing spree outside a mosque in Turkey last month and a 2022 shooting spree at an LGBT bar in Slovakia. That perpetrator sent a manifesto to Mr. Allison thanking Terrorgram for inspiring him, authorities said.

“Building the future of the White revolution, one publication at a time,” the attacker, Juraj Krajcik, wrote.

He killed two bar patrons and wounded a bar employee then later killed himself.

• Stephen Dinan can be reached at sdinan@washingtontimes.com.