MIAMI AP – A federal judge agreed Tuesday to allow the IRS to serve legal papers on Swiss banking giant UBS AG in an expanding investigation into U.S. taxpayers who may have used overseas accounts to hide assets and avoid taxes.

The order from U.S. District Judge Joan Lenard came one day after the Justice Department requested authority for the IRS to issue “John Doe” summons to UBS. The summons are used in IRS tax fraud investigations when the identity of the people involved isn’t known.