Employees who spoke out about it were threatened or beaten.
While Browder admits the bill is limited in scope, he hopes it will make human rights abusers who have a financial incentive think twice before committing their crimes.
"The people who committed this crime didn't do it for ideological reasons, didn't do it for religious intolerance; they did it for money," Browder said. "The people who commit these kinds of financial crimes enjoy keeping their money and spending it outside of Russia. If we could take away their ability to travel to the West and spend their ill gotten gains in the West, that might not be real justice, but it is at least a step in the right direction."
McCain also sent a letter to Obama Tuesday urging him to use an executive order to blacklist members of the Kluev Group, the Russian crime group closely tied to Magnitsky's murder.
"Such and action would be a powerful compliment to the Congress's consideration of the Magnitsky Act," McCain said.
McCain said the bill is an essential step in moving protecting human rights across the globe.
"The Russians have said this is an anti-Russian piece of legislation; I couldn't disagree more," McCain said. "I believe the Russian people want corrupt officials to be held accountable and punished for their crimes."