Thomas C. Frongillo

O: (617) 401-7289
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Thomas C. Frongillo

Thomas C. Frongillo is a trial lawyer with over 30 years of litigation experience, specializing in white collar criminal defense. He represents corporations and individuals in white collar prosecutions and corporate and regulatory investigations involving the Economic Espionage Act (EEA), cryptocurrency, health care fraud, securities fraud, commodities fraud, public corruption, the Foreign Corrupt Practices Act (FCPA), the Racketeer Influenced and Corrupt Organizations Act (RICO), and environmental crimes.

Throughout his career, both as a private practitioner and as a federal prosecutor, Thomas has been called upon to handle a multitude of complex, high-stakes cases involving a wide range of legal issues in jurisdictions across the country. In 2013, he served as Special Counsel to the Massachusetts House of Representatives Committee on Ethics in an investigation of possible misconduct by a State Representative. He has represented the Massachusetts Legislature in a federal grand jury investigation of alleged corruronpt hiring practices involving the Massachusetts Office of the Commissioner of Probation. In other high-profile matters, Thomas has successfully represented the majority owners of an NBA team in a dispute concerning a trade of one of the NBA’s top players; the engineers who designed the ceiling of the Big Dig’s connector tunnel near Logan Airport in Boston that collapsed in 2006; a Fortune 50 company in an investigation by the SEC of alleged securities fraud stemming from the financial crisis of 2008; a bank in the Nation’s largest bank failure; a University in an investigation of alleged financial impropriety by its former president; and a non-profit Rhode Island hospital indicted on federal public corruption charges. In 2009, he obtained an acquittal of a senior executive of W.R. Grace in a landmark three-month criminal jury trial, United States v. W.R. Grace, in which his client was vindicated on charges of knowing endangerment under the Clean Air Act and conspiracy to defraud the United States. The Justice Department characterized the case as the most significant criminal environmental prosecution in United States history. Recently, in 2018, he obtained an acquittal of a prominent real estate developer charged with committing extortion in violation of the Hobbs Act in United States v. DeCicco. In that case, through vigorous discovery efforts, the defense uncovered evidence of undocumented meetings between federal agents and a government confidential source, as well as the government’s failure to preserve critical evidence. This resulted in the district court’s issuance of jury instructions on spoliation of evidence and the government’s failure to follow normal investigatory practices.

Thomas has been named a “Leading Lawyer” for White Collar Criminal Defense and for Trade Secrets by The Legal 500 USA, a “Best Lawyer” in White Collar Criminal Defense by The Best Lawyers in America© , and a “Leading Lawyer” by Chambers USA, which noted that he has been described by clients as “one of the smartest people I’ve ever met” and an advocate who “brings a very calming influence.” His publication titled “The Reinvigorated Confrontation Clause: A New Basis to Challenge the Admission of Evidence from Nontestify Forensic Experts in White Collar Prosecutions”, co-authored with Caroline Simons, received the IADC 2015 George W. Yancey Memorial Award. While serving as a federal prosecutor, Thomas received many awards and commendations from the United States Department of Justice, the FBI, the DEA, the ATF, the Customs Service, the IRS, and various state and local law enforcement agencies.


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