They claim that only state actors could have carried out the assault on the Russian dissident.
The Russian opposition leader will be sent to a penal colony for failing to meet with probation officers while he was comatose due to poisoning.
"It's an escape hatch from tyranny," writes the Human Rights Foundation's Alex Gladstein. "It's nothing less than freedom money."
More than 5,000 people were detained across Russia on Sunday
The political activist's fraud conviction has been called a "politically motivated" Kremlin plot to keep him from running for office.