There are a few "Vias" here, but the Ft. Lauderdale-based Sun-Sentinel has a story referring to a Yardbarker post where some fans were shown on television in Fidel Castro garb (click either of the links for an image). Then the Astros kicked them out of Minute Maid Park.
It was only a matter of time before some imbeciles decided it was appropriate to wear a costume of this dictator to a baseball game. Glad to know the Astros handled this with class.
UPDATE: The Fidelians apparently were not kicked out of MMP, just their seats. Waiting on video.