In that sometimes-heavily-redacted document, investigators detailed how they’ve been receiving cooperation from former Ald. Danny Solis in their case against Burke. Prosecutors also deny what Burke’s lawyers have repeatedly alleged: that he’s been unfairly targeted in the case. In Nov. 2018, Burke’s office at City Hall, as well as his ward office, were raided by FBI agents. That kicked off the start of a corruption investigation against the alderman, who is accused of using his position on the city council to steer business to his private law firm. Documents show details of Solis’ cooperation in the investigation, with federal agents tapping six phone lines at Burke’s office as the chairman of the Finance Department. Agents also monitored his cell phone for nine months, according to the documents.