It was late September, and Donald Trump had been president for 248 days. In the weeks after the election, Browder was "worried and confused." Trump has a creepy habit of praising Putin, but he'd also surrounded himself with Russia hard-liners like General James Mattis, Nikki Haley, and Mike Pompeo—secretary of defense, ambassador to the United Nations, and director of the CIA, respectively. Browder war-gamed the Magnitsky Act but didn't see any way that Trump could kill it—Congress would have to repeal the law—only a chance that he might refuse to add more names to the target list. (Five people were added to the list last January, bringing the total to 44.) He figured the same was true with the Global Magnitsky Human Rights Accountability Act, which President Obama signed shortly before leaving office, expanding the targeted-sanctions tool to human-rights abusers worldwide. The Russians hate that law, too, because having "Magnitsky" in the title reminds the entire planet where the standard was set and by whom.
Source : https://www.gq.com/story/bill-browder-putin-enemy-number-1