Soviet dissident Vladimir Bukovsky is set to go on trial in England Monday after being charged with possession of child pornography.

Bukovsky, 73, has spent the majority of his life fighting the Russian regime—in labor camps, in prisons, amid deportation, and on hunger strikes. His most recent plight began after he served as a witness in the case of his friend Alexander Litvinenko, who was poisoned by the Russian government in London in 2006. Bukovsky appeared on an alleged FSB [Russian security service] hit list that same year, alongside Litvinenko, businessman Boris Berezovsky (found dead in 2013), and two others.