Outside Wrigley Field this afternoon, before and during the Cubs-Diamondbacks game, protesters will make much hay of Arizona’s new anti-immigration law. This strikes us as strange, if only because the Diamondbacks are just a bunch of baseball players who probably don’t live in Arizona anyway, and the traffic outside Wrigley is already a disaster. At Yahoo! Sports, Jeff Passan details the real reason Major League Baseball is furious and terrified by the crazy new Arizona law: It could very well get its young players arrested during spring training. Passan talks to the Royals’ Jose Guillen, who came to the U.S. to play in the Pirates organization at the age of 16 and who would have never understood, at that age, the importance of a passport and papers with him at all times. MLB is worried about its players being detained without any real understanding what’s happening. “It’s just crazy we’re even talking about this,” Guillen tells Passan. “If you don’t have your passport, what does that mean? You’re going to jail? I don’t know what to say to that.”