While not much is known about the identities of the other informants in the Proud Boys, the bureau had placed secret sources in several chapters around the country, including in Cleveland and in Salt Lake City, according to a private log of internal F.B.I. messages obtained by The New York Times.
During the trial, defense lawyers have also mentioned an informant known only as Danny Mac, who once led a Proud Boys chapter in New Jersey. Matthew Walter, a former chapter president from Tennessee, told The Times last month that he had a relationship with the F.B.I. that lasted several months around the time of Jan. 6 and added that as many as 20 other members of the group did as well.
Ms. Loh said that she began working with the F.B.I.’s office in San Antonio, Texas, in 2018 or 2019 after falling victim to an attack from what she described as activists from the leftist movement antifa. At first, she said, she gave the bureau what she believed was “useful information” on leftist protesters.
Soon, however, she began getting paid for her work. At that point, Ms. Loh, who once served as a top official in an organization called Latinos for Trump, started providing information to the F.B.I. on “any type of domestic terrorism — on the right or the left,” she said.
More recently, according to the government, Ms. Loh has been active in assisting people charged in the Capitol attack “in fund-raising efforts and protesting against their conditions of confinement.” She also confirmed the government’s contention that she engaged in discussions with one of the defendant’s family members about replacing a defense lawyer in the case.
The constant and unexpected emergence of informants has unsettled the defense team. At the court hearing on Thursday, several defense lawyers complained to Judge Kelly that they had no idea if there were more informants hiding in the wings.
“There’s more C.H.S.s than there are defendants in this case,” Sabino Jauregui, one of Mr. Tarrio’s lawyers said, using an abbreviation for confidential human source, the F.B.I. official term for an informant.
“I asked my intern the other day if she’s a C.H.S.,” he said.
