BOSTON — Nurse Ellen MacInnis has worked at St. Elizabeth's Medical Center for 26 years. She saw private equity rescue St. E's and other Bay State charity hospitals, only to later take "so many resources" from them.

On Tuesday, June 11, in a park outside the Brighton hospital, Sen. Elizabeth Warren, D-Mass., announced she's filing a bill called the Corporate Crimes Against Health Care Act. The proposed law is a response to the bankruptcy and alleged mismanagement of Steward Health Care. Steward, with help from the private equity firm Cerberus, grew from a handful of Catholic hospitals in Massachusetts to a sprawling nationwide network.

Warren's bill focuses on the private equity business model. Its defenders say private equity serves a crucial role of taking under-performing assets and returning them to productive use. Warren said that approach should have no place in health care.

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