New Delhi, Nov. 16 -- Adriana Kugler made unauthorized Apple and airline stock trades worth up to $250,000 during Federal Reserve blackout periods, prompting ethics investigation and Jerome Powell's waiver refusal before her abrupt August resignation

A damaging ethics investigation into unauthorized stock trades forced former Federal Reserve Governor Adriana Kugler to resign in August, newly disclosed government documents reveal, casting a shadow over the central bank's integrity safeguards and raising questions about oversight of officials who wield extraordinary influence over the American economy.

The U.S. Office of Government Ethics released Kugler's termination disclosure report late Friday, exposing a pattern of trading violations...