If you look hard enough, you'll know who's assigned the responsibility in a source witness protection program. We all have substantive jobs. If you look hard enough, you can mine that out.
That being said, it's my experience that many members of the RCMP, if they were asked who the source witness protection person was for the province of Alberta, wouldn't know. They wouldn't know unless they went to seek it out.
And that being said, organized crime does have, and they can form, the interest to seek it out. They can seek it out by leveraging community sources, people who work within the policing environment, be they civilians or be they police officers. The fact that it's not openly available to this interested inquirer doesn't make it any less real. It can be found.