Historical Overview of U.S. Signals Intelligence and the Black Chamber

Historical Overview of U.S. Signals Intelligence and the Black Chamber The passage provides a historical narrative about early U.S. code‑breaking efforts and the closure of the Black Chamber by President Hoover. It contains no new, actionable leads, specific transactions, or allegations involving current powerful actors. Its relevance is limited to context rather than investigative value. Key insights: U.S. Army and Navy established code‑breaking units before WWI.; These units merged into the Code Compilation Company after WWI.; Herbert O. Yardley led the Black Chamber, which intercepted telegrams via Western Union.