One of Mueller's hires has experience prosecuting SATER, one of DT's mob associates.
https://www.bloomberg.com/view/articles/2017-06-21/trump-russia-and-those-shadowy-sater-deals-at-bayrock
Kriss's assertion that Bayrock was a criminal operation during the years it partnered with Trump has been deemed plausible enough to earn him a court victory: In December, a federal judge in New York said Kriss's lawsuit against Bayrock, which he first filed nine years ago, could proceed as a racketeering case.
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Trump has said over the years that he barely knows Sater. In fact, Sater who former Bayrock employees say met frequently with Trump in the Trump Organization's New York headquarters, once shepherded the president's children around Moscow and carried a Trump Organization business card apparently has remained firmly in the orbit of the president and his closest advisers.
Sater made the front page of the New York Times in February for his role in a failed effort along with Trumps personal attorney, Michael Cohen to lobby former National Security Adviser Michael Flynn on a Ukrainian peace proposal.
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It's unclear whether Sater and Bayrock are part of Mueller's investigation. But Mueller has populated his investigative team with veteran prosecutors expert in white-collar fraud and Russian-organized-crime probes. One of them, Andrew Weissmann, once led an FBI team that examined financial fraud leading to the demise of Enron. Before that, Weissmann was a prosecutor with the U.S. attorney's office in Brooklyn and part of a team that prosecuted Sater and mob associates for investment scams in the late 1990s.