The documents released by the city include two search warrants executed Nov. 29 and Dec. 13 at Burke's Finance Committee offices in City Hall. They refer anonymously to individuals A, D, E, F, G and H and entities A-N, which the FBI was apparently seeking documents and communication about.
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"It says that there's - it's a pretty broad scope to the investigation, involves some number of people who can be any combination of wrongdoers, witnesses and victims," said ABC7 legal analyst Gil Soffer.
Burke is accused of shaking down a restaurant owner, trying to steer property tax business to his law firm Klafter and Burke in exchange for building permits.
RELATED: Ed Burke, longtime Chicago alderman, charged with attempted extortion
The search warrants show the FBI seized computers, hard drives and USB storage devices. A handwritten page lists a file for Brian Hynes, Klafter and Burke correspondence and checks and 14th Ward TIF files.
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One paragraph where the feds say they are looking for "documents and communications evidencing agreements to compensate any party for business or income realized by Klafter and Burke... including but not limited to agreements concerning referral fees, fee-splitting, fee-sharing and consulting agreements" was among several that caught Soffer's eye.
"The complaint simply describes pretty basic effort on the part of Alderman Burke to extort business from executives of a restaurant company. In exchange for the favors that he would give, there's no mention in the complaint of fee splitting. There's no mention in the complaint of fee sharing, referral fees, consulting agreements. It suggests that there's more out there," Soffer said.
Burke has claimed that he's done nothing wrong and is seeking reelection.