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This work has, among other things, led to the rescue of 23 children from rape and assault, the seizure of a quarter-million child abuse videos, and the arrest of 370 alleged pedophiles. It has resulted in the largest-ever seizure of cryptocurrency headed to Hamas, al-Qaeda and the Islamic State. When Changpeng Zhao, chief of the world’s biggest cryptocurrency exchange, Binance, reported to prison in June, it was because Koopman’s small cybercrime team had uncovered evidence of the firm’s money laundering for terrorists and sanctions-busting for Iran, Syria and Russia. In the past 10 years, this work has returned more than $12 billion to victims of crime and to the U.S. Treasury. If he worked anywhere else, Koopman would probably be celebrated. But he’s employed by the Internal Revenue Service, the arm of government that even its commissioner, Danny Werfel, describes as “iconically unpopular.
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