From SI.com:
"There’s remarkably little about defensive positioning in the Official Baseball Rules. It’s not just that there isn’t an exact rule about how many men must be on each side of second base, or about how deep an infielder can play, or about how many outfielders there must be—it’s that there isn’t even a rule saying that there must be infielders and outfielders in the first place. There’s a rule saying that there must be nine players. (The very first rule, actually Rule 1.01.) And that’s… it, pretty much. There’s a section titled Fielding Positions, but it only offers specifics about the battery. As for everyone else? “Except the pitcher and the catcher, any fielder may station himself anywhere in fair territory.” That’s all."
So for those who advocate banning the shift, how do you propose to do so?