As you may know, the National Union of Public and General Employees (NUPGE) is currently in a dispute with the Canadian Labour Congress (CLC) over the fundamental issue of raiding (when one union tries to take members away from another union).
Raiding is destructive to solidarity, doesn't advance the interests of workers and wastes precious resources that should be used to service members and organize non-union workers. Unfortunately, some CLC affiliated unions continue to raid other CLC affiliates. NUPGE has never subscribed to the position that some other CLC affiliates have taken: "if you are raided, then you should just raid back."