Philadelphia has filed a lawsuit against several Wall Street investment banks over an alleged conspiracy to set interest rates on city borrowing, costing public institutions like public colleges and hospitals to pay billions in “inflated interest.”

The lawsuit says JPMorgan, Goldman Sachs, Wells Fargo, Bank of America, Citigroup, Barclays, Royal Bank of Canada and affiliates conspired to fix rates for tax-exempt bonds called variable rate demand obligations or VRDOs.