In a career that has spanned over half a century, Verges’ clients have ranged from gang leaders to war criminals, militants, terrorists and most wanted international fugitives.

A friend of Pol Pot, the notorious Khmer Rouge leader behind Cambodia's genocide, one of Verges’ most talked-about cases was defending former Gestapo chief Klaus Barbie.

Several years ago, the French lawyer agreed to appear in a documentary film by a Tehran-born filmmaker.

Barbet Schroeder describes his movie, entitled “Terror's Advocate”, as “entertaining like a thriller”, but says it demands high attention, because there is so much information in it that the viewer has to digest along the way.

Schroeder believes one of the greatest subjects of art is the nature of evil. Is “the Devil’s Advocate”, Jacques Verges, one of the toughest men the 68-year-old filmmaker has ever met?

“The bravest – yes, but also the most intelligent, and definitely the toughest to crack!” Schroeder told RT’s Valeria Paikova during an interview in Paris.