This bothers me - I'm a rabid Cleveland Indians fan. Just watched Major League last week (it's a Rite of Spring).
So, when it appears that Americans are displaced from jobs by Columbian players, primarily to save money, it's time to take action.
Check out these links to the story, the original post about the Yuma League, the news story, and a followup post on VDare.
Pay special attention to the money issue - it's another variant of the same issue that other fields overrun by these "temporary workers" have been pretending isn't a problem.