I found this info not sure if it helps
The fact that Bernie Sanders (I-VT) voted against the so-called Magnitsky Act of 2012 imposing targeted sanctions on Russian oligarchs to punish the Putin regime for human rights abuses is often cited as “proof” by liberal conspiracy theorists that Sanders was somehow culpable in the Kremlin’s targeted effort to damage the candidacy of Hillary Clinton as part of their broader attack on the 2016 U.S. election.
What liberal conspiracy theorists won’t tell you is that Sanders was joined in voting nay by Carl Levin (D-MI), Sheldon Whitehouse (D-RI), and Jack Reed (D-RI) none of whom stand accused by anyone of being Russian stooges.
What liberal conspiracy theorists won’t tell you is that the Obama administration opposed the Magnitsky Act. The administration flip-flopped only after the sanctions were attached to a bill normalizing trade relations with Russia, hence the bill’s official name: The Russia and Moldova Jackson-Vanik Repeal and Sergei Magnitsky Rule of Law Accountability Act of 2012 (H.R. 6156).
What liberal conspiracy theorists won’t tell you is that Sanders voted for a second, more robust version of the Magnitsky Act in 2015.