Freedom of association is a concept that refers to the right to peaceably assemble and petition a government. It is thought to be an effective way for people to join with similar greavances, and is meant to achieve some lawful political end
... winner of the Nobel Peace Prize
April 16 - Fifi D'Orsay, actress (+ 1983)
April 22 - Robert Oppenheimer, physicist (+ 1967)
May 6 - Harry Martinson, swedish author, ...