The document lists AMSTALK-1 is the assigned cryptonym of Miguel Angel Diaz Isalgue.
An CIA Office of Security memo that states AMSTALK-1 would be traveling from Argentina to the United States. AMSTALK-1 used the travel alias Juan Hidalgo Elizondo Romano, was used by the Agency operationally since 1961. Also see 104-10113-10209, documenting his return under that pseudonym.
A memo that reaffirms the identity of AMSTALK-1 and that he would be travelling to Miami.