One of its main campaign issues was against a nuclear holocaust and third world war, working with organizations such as the World Peace Council and the World Federation of Democratic Youth of which the NFLY was a founding member.
One of its major efforts was petition for the Stockholm Appeal.
On March 15, 1950, the World Peace Council approved the Stockholm Appeal, calling for an absolute ban on nuclear weapons. The appeal was initiated by the physicist Frédéric Joliot-Curie, a nuclear scientist and Nobel Prize winner. The text of the Appeal read:
We demand the outlawing of atomic weapons as instruments of intimidation and mass murder of peoples. We demand strict international control to enforce this measure. We believe that any government which first uses atomic weapons against any other country whatsoever will be committing a crime against humanity and should be dealt with as a war criminal. We call on all men and women of good will throughout the world to sign this appeal.Here are some newspaper stories from the Pacific Tribune, the west coast edition of the Canadian Tribune; Both newspapers were published by the Labour Progressive Party, as the Communist Party of Canada was then know.
Peace Actist Attends World Youth Festival - July 27 1951 - Pacific Tribune by Young Communist League