" . . . and in his last years he became involved in a tangled legal battle with a former manager, Martin Siskind, whom Mr. Young sued for mismanaging funds. Mr. Siskind successfully petitioned a judge to have Mr. Young declared mentally incompetent, and his affairs were placed in the control of legal guardians. Several of Mr. Young’s friends say that he was in no way incompetent, and that the arrangement had left him destitute."
That's from Bruce Weber's obituary in today's New York Times for outsider artist Purvis Young. I mentioned the Siskind lawsuit back in 2007 here.