In our experience with collective agreements, even in cases where the agreement was blatantly violated, people wait until they're desperate and they have no other avenue of recourse possible to file a grievance. This is even for something normal. A great deal of water may have flowed under the bridge before they file a complaint regarding malfeasance or wrongdoing. I wouldn't advise them to do so.
We would like to see provisions in the legislation that help actually protect anonymity. Mr. Korosec is absolutely right. In many cases, we're not talking about the vice-presidents of organizations. We're talking about mid-level employees who don't make disclosures on a routine basis. We really need to keep this in mind.