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The dispatches from one of India's most troubled generic drugmakers were contrite, filled with far-reaching promises to clean up its factory, stop contamination, and send safe medication to Americans counting on the company's drugs.

"We have started addressing FDA concerns very aggressively and comprehensively," an executive from Sun Pharma wrote to the FDA in 2015.

"Sun is ensuring the presence of a strong, independent quality unit," the company repeatedly pledged.

An FDA inspection in 2014 had turned up dangerous violations at Sun's factory in the Indian city of Halol, and the details were grim: Managers weren't following basic rul

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