This came from the times when Congress wasn't deadlocked. If someone cornered a different small market they could make another law against that.
The point is that it's silly that the law is specific to onions, and the explanation "it's because onion market was small enough to be cornered" is unsatisfactory because there are other small markets too
The point is that it's silly that the law is specific to onions, and the explanation "it's because onion market was small enough to be cornered" is unsatisfactory because there are other small markets too