Related Clues:
- Eavesdropping org.
- C.I.A.'s predecessor
- C.I.A. progenitor
- Old spy org.
- Former intelligence org.
- Secrets keeper: Abbr.
- Code-breaking org.
- Code-breaking govt. group
- CIA precursor
- CIA's precursor
- Intelligence grp. established by Truman
- Agency that led to the CIA
- Govt. org. that employs mathematicians
- Forerunner of the CIA
- Cryptologic grp.