This isn't uncommon though -- even 30 years ago MLB would kick people out for any kind of signage they found off-brand, not even political in nature. Unless is

This isn't uncommon though -- even 30 years ago MLB would kick people out for any kind of signage they found off-brand, not even political in nature. Unless is extremely typical of what you normally see at a game, you're not going to be allowed to show it.