Federal prosecutors say four members of a neo-Nazi group ran a child exploitation ring that coerced minors into producing sadistic, abusive pornography.

Members of the group “participated in their online child exploitation activities because they wanted to create an army of sadist followers.”

In the case of the San Bernardino County children, a boy, identified in the indictment as co-conspirator R.M., conspired with a girl identified as Minor Victim 13 as well as a co-conspirator to produce pornography of herself and a prepubescent child, both county residents.

Four men face charges after investigators said they took part in an online neo-Nazi group that exploited children, according to the U.S. Department of Justice.