An American’s Murky Path From Russian Propagandist to Jan. 6

“Trump’s election is perhaps akin to Luther nailing his theses to the door, but now the demons are wakened, and they know they must fight or be killed, and as in the 16th century, they will not go quietly,” he wrote. “And there will be blood. Let us hope that it is the figurative, digital kind, and not the real, red, hot, sticky stuff.”

A turning point came in January 2018, when Mr. Bausman posted a lengthy polemic, “It’s Time to Drop the Jew Taboo,” that was both an antisemitic manifesto and a call to action for the alt-right.

“The evidence suggests that much of human enterprise dominated and shaped by Jews is a bottomless pit of trouble with a peculiar penchant for mendacity and cynicism, hostility to Christianity and Christian values, and in geopolitics, a clear bloodlust,” he wrote.

It was welcomed by white nationalist figures like Richard Spencer, who called it “a major event.”

Outside the far right, Mr. Bausman’s embrace of antisemitism was widely condemned. The U.S. State Department flagged it in a report on human-rights concerns in Russia, and the diatribe prompted a disavowal from RT.

After the death in August 2018 of his mother, who left an estate valued at about $2.6 million, Mr. Bausman bought two properties in Lancaster, Pa., where his family had roots.

His older sister, Mary-Fred Bausman-Watkins, said last year that her brother “was always short on money” and that their parents frequently helped him out, according to the Southern Poverty Law Center, which has compiled several reports on his activities. Ms. Bausman-Watkins died in May.