Cryptonym: LIBIGHT
104-10054-10060: MEXICO STATION COVERAGE OF SOVIET AND CUBAN EMBASSIES (1963)
"The station also conducted a unilateral mail intercept operation, LIBIGHT, which was handled by an American case officer. A recruited Mexican agent, who had a semiofficial status, obtained selected letters from a subagent employed by the Mexican postal system. https://www.archives.gov/files/research/jfk/releases/104-10050-10224.pdf
104-10268-10004: HELMS HEARING DUPLICATE - VOLUME 1, COPY 6 OF HELMS HEARING.
"LIBIGHT was the crypt for a unilateral mail intercept handled by Charles Anderson III. The agent (Mexican) had a semi-official status and arranged to obtain selected letters from a sub-agent in the postal system (I think at the airport.) His case officers were later Alfonso Spera, (Louis) Puckett, Robert Feldmann, and Alan White."
"LIBIGHT was the crypt for a unilateral (originally)mail intercept handled by Charles Anderson III. The agent (Mexican) had a semi official status and arranged to obtain selected letters from a sub-agent in the postal system (I think at the airport). His case officers were later Alfonso Spera, Puckett, Robert Feldmann, and Alan White...LIELEGANT also manipulated control over the principal agent of LIBIGHT mail intercept.
104-10098-10180: ROBERT KAFFKE
This dispatch notes that "enclosed is a microfilm of reference letter" and lists the source as "LIBIGHT/LIMUD."
104-10406-10112: VOLUME I/SUPPORT DOCUMENTS FOR THE HELMS HEARING AT HSCA
This page of support documents for Richard Helms HSCA appearance makes reference to the LIBIGHT mail intercept operation.
At LIBIGHT, Alfonso Spera was the inside man and Turner Smith was the outside man.