I checked and Browder has dual citizenship so his contribution to Clinton is legal
William Felix Browder is an American-born Jewish-British financier. He is the CEO and co-founder of Hermitage Capital Management, an investment fund that at one time was the largest foreign portfolio investor in Russia. He gave up his U.S. citizenship in 1998 to avoid paying taxes related to foreign investment. After having business in Russia for ten years, Browder was refused entry to Russia in 2005 as a threat to national security; he has said it was because he exposed corruption.