
Bill Browder's journey started on the South Side of Chicago and moved through Stanford Business School to the dog-eat-dog world of hedge fund investing in the 1990s. It continued in Moscow, where Browder made his fortune heading the largest investment fund in Russia after the Soviet Union's collapse. But when he exposed the corrupt oligarchs who were robbing the companies in which he was investing, Vladimir Putin turned on him and, in 2005, had him expelled from Russia. In 2007, a group of law enforcement officers raided Browder's offices in Moscow and stole $230 million of taxes that his fund's companies had paid to the Russian government. Browder's attorney Sergei Magnitsky investigated the incident and uncovered a sprawling criminal enterprise. A month after Sergei testified against the officials involved, he was arrested and thrown into pre-trial detention, where he was tortured for a year. On November 16, 2009, he was led to an isolation chamber, handcuffed to a bedrail, and beaten to death by eight guards in full riot gear. Browder glimpsed the heart of darkness, and it transformed his life: he embarked on an unrelenting quest for justice in Sergei's name, exposing the towering cover-up that leads right up to Putin.
As for the "pure psychopaths" bit... Russia has a long history of sacrificing its citizens for the Greater Good. The "meat grinder" in Ukraine is one example. Another, quite unambiguous one, is the Dubrovka theatre hostage crisis: https://en.m.wikipedia.org/wiki/Moscow_theater_hostage_crisi... . Terrorists (Chechen actually, though there is speculation, again, about FSB involvement) took a whole Moscow theatre hostage. The anti terrorist units attacked, killing all 40 terrorists but also over 120 of the hostages. A combat gas was injected into the theatre, which incapacitated the terrorists and allowed an armed attack, but also killed lots of the bystanders.
As for books, I can't recommend any "latest history" books on Russia, but you could do a lot worse than "Red Notice" by Bill Browder for general context. It's a great book, about a Western (American?) guy who goes to Russia in the 90s, sets up an activist hedge fund, and makes a killing. All was well so long as he was useful to the government, but when their paths diverged, all got rather messy.
They read like fiction and gave me a whole new appreciation for how Russia works, plus international politics and investing.