The Magnitsky Act makes it increasingly more difficult for Russian criminal operatives and members of Putin's elite inner circle to invest their ill gotten wealth abroad into democratic Western societies.
 
Endemic Russian money laundering will be mitigated to some degree, but not entirely curtailed. Magnitsky will however, pose new and more difficult obstacles for Putin's elicit underground money train flowing to and from the Kremlin in defiance of current economic sanctions imposed on Russia for its illegal invasion of Crimea and Eastern Ukraine. 

The Magnitsky Act is another nail in Putin's coffin. Totalitarian regimes do not last indefinitely and Putin is no exception.