Edmond Valin is a guy in Canada who makes guesses at who the rat is in his Rat Trap articles, he has nothing at all to go by for certain. He also has a noted tendency to pick the highest person he can as his suspected rat, and blends actual reports that don't name the informer with his opinions where he gives the name of the informer as if it's fact.
Just another of a million people with blogs who think they are experts.