Harry Markopolos, the former money manager who says regulators didn't act on his tips about Madoff, canceled his appearance.
前货币经理哈里·马克波路斯说管理者并没有向他透露马道夫的消息，所以取消出席听证会。
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The story of how Mr Markopolos discovered the world's largest Ponzi scheme is interesting enough, but the real meat of his account concerns the investigations that did not happen.