List of suspected Nazi war criminals welcomed in Canada should stay secret, information watchdog rules
(www.theglobeandmail.com)
If Canada isn't charging them with a crime, then releasing their names is just starting a witch hunt, and government sanctioned witch hunts are a bad idea.
They should be charged, and if found guilty, named and deported or jailed, though I think at this point they're all likely dead. They may have relatives that are still alive, and there's no reason to get them involved.