Brought to the U.S. by the FBI as a material witness in 2023, an informant against the MS-13 gang is now facing deportation back to El Salvador. Federal officials revealed his identity during the case in which he was supposed to testify, which means that he will be identified as a snitch if he is forced to return. He is currently seeking asylum, arguing that deportation would amount to a death sentence. WBUR, an NPR public radio station, reported on the story here: U.S. wants to deport FBI informant who was set to testify in gang case in Mass.
Informants are especially vulnerable in the immigration space. For another example of an El Salvadoran informant, this one a mere teenager, who was deported notwithstanding his cooperation, see this previous post: ICE marks 17-year-old informant for deportation and death.