A Harvard Law School professor best known for defending the man who leaked the Pentagon Papers and for helping parents sue chemical companies in a case popularized by the film “A Civil Action” has a new cause: poker.

Charles Nesson wants governments to relax restrictions on poker players. He has formed the Global Poker Strategic Thinking Society with some of his students to promote poker as a fun learning tool and to redefine it as a game of skill rather than a game of chance.