When Milwaukee boss Frank Balistrieri sought new revenue streams for his organization, he brought in Gurera to help shake down operators of illicit enterprises in southeastern Wisconsin. While Gurera's activities generated income, they also brought a lot of "heat" on Balistrieri's crime family. The boss soon ordered Gurera to return to the Kansas City area.
The FBI became aware of goings-on in both criminal organizations through data revealed by informant KC-586. Comparing evidence found in FBI documents with the details of Gurera's life, Valin proves that Gurera served as an informant over a period of a few months before he died of a heart attack in 1967.