I'm not very familiar with their history, honestly. But aren't you excluding two very good examples? Abstractly, I consider their effectiveness as separate from whether this should be under their purview. If they're ineffective, they should be fixed instead of having other agencies subsume their responsibilities.
I'm actually referring to one example. The reason why I don't count it is because it looks a LOT like it's being blocked for partisan reasons, rather than concerns about an actual monopoly. TWC owns CNN and the federal government wants them to divest it.
