1978 CIA Memo on Declassifying Richard Helms's HSCA Testimony, Naming AMLASH

AMLASH was the CIA cryptonym for Cuban official Rolando Cubela, at the center of a CIA-linked plot against Fidel Castro; this memo specifically instructs that his true name be replaced with the cryptonym in any declassified material.

It notes that details of CIA telephone and photographic surveillance coverage in Mexico City — the same station where Lee Harvey Oswald visited the Soviet and Cuban embassies in 1963 — might be impossible to declassify at all.