Calomiris was recruited by the FBI in 1942 and infiltrated the CPUSA, gaining access to a membership roster.[44] She received a salary from the FBI during her seven years as an informant.[44] Calomiris identified four of the defendants as members of the CPUSA and provided information about its organization.[45] She testified that the CPUSA espoused violent revolution against the government, and that the CPUSA – acting on instructions from Moscow – had attempted to recruit members working in key war industries.[46]