A court-appointed receiver trying to recover funds for victims of Tom Petters' Ponzi scheme has sued JPMorgan Chase & Co. for more than $300 million, alleging the bank should have known that money it seized from Petters was the result of fraud. The Minnesota businessman was convicted last year of perpetrating a $3.7 billion Ponzi scheme that counted hedge funds, pastors, missionaries and retirees among its victims. Prosecutors said the one-time owner of Polaroid Holding Co. and Sun Country Airlines orchestrated the plot, but Petters has blamed his associates and is appealing his 50-year prison sentence. JPMorgan, its affiliates and...