Thanks to a "lurker" to this video of a talk in Las Vegas by Mark Galeotti, on his special subject. Intrigued that the city has the 'Mob Museum', formerly the National Museum of Organized Crime and Law Enforcement. See:https://themobmuseum.org/

Mark's blogsite has his slim bio:https://inmoscowsshadows.wordpress.com/about/

Link to the video (50 mins):https://livestream.com/accounts/6847...deos/180845397

Curiously he relies on a conversation with a Chechen "hitman" who was in the USA for several years plus a jail term, before his extradition to Russia, where the case "fell apart" so he was back home in the post-Gorbachev Russia.