(Bloomberg) Convicted “Pharma Bro” Martin Shkreli is in prison serving a seven-year sentence, but that hasn’t tamed his appetite for using the courts to battle former colleagues and clients. On Friday, he claimed a former investor in his Elea Capital hedge fund forced him to sign a $250,000 promissory note that is now unenforceable. Shkreli alleges Lee Yaffe, a former business associate who became a prosecution witness, directed his father to start a wrongful legal action that has since resulted in a $420,000 judgment, according to a complaint filed in Brooklyn federal court.

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