The lawsuit filed in bankruptcy court Friday in Manhattan said six longtime investors wiped out by the scandal together lost life savings of $9 million — the amount on fictitious statements issued by Madoff's defunct firm in 2008.

It challenges rules that could disqualify the plaintiffs from collecting up to $500,000 in government-backed compensation because over the years they withdrew more money — believing it was profit — than they originally invested.

By law, trustee Irving Picard has an obligation "to protect a customer's legitimate expectations of what the broker held in his account — even if the broker never purchased any securities in the first place," the suit argues.

Among the plaintiffs named in the suit filed last week: a 73-year-old New Jersey widow who's been forced to take a part-time job at Macy's to cover basic living expenses; a 76-year-old California man who had to sell his home and move in with his daughter; and an 88-year-old Manhattan woman who lives with her ailing husband of 69 years and has stopped paying medical bills because they need the money for food.