paragraph: Former prosecutor Michael Mazzariello was finally doing the kind of legal work he'd always dreamed of, but after less than a year of helping East New York's poor, he's getting booted from the bodega he turned into an office. Nearly a year ago, Mazzariello, a former assistant district attorney who grew up in East New York, started a nonprofit practice helping the working poor navigate the legal system. Immigration, landlord-tenant disputes and even criminal cases are the specialty of his East New York Legal Services Corp. on New Lots Ave. The office, in a former bodega, was Mazzariello's idea, and he got some help from high places early on. "I picked up the phone and called Rudy Giuliani on his radio program," Mazzariello said. "I said, 'Mr. Mayor, we're interested in renting space in a building the city owns. "I swear, within an hour, the building was ours. We filled out all the paperwork. We got the nonprofit status from the feds. We were rolling." Refusing to charge clients, Mazzariello, 42, said he used his family's savings to sustain the office during the first year. Already recognized as a federal nonprofit, the agency is awaiting state status that would allow it to survive on charitable donations. "This is what I want to do - to give back to the community," said Mazzariello, who worked under Brooklyn District Attorney Charles Hynes from 1990 to 1993, followed by a stint as the Board of Education's chief prosecutor. Under the city Housing Preservation and Development Department's tenant ownership program, Mazzariello and partner Joe Guzzo learned they could rent to own. They invested $8,500 in a new facade, rest room makeover and other modest improvements. 
question: What kinds of cases does Mazzariello's nonprofit specialize in when providing services to the working poor?
answer: Criminal cases