According to the San Francisco Chronicle MLB is censoring fans wanting to display signs in protest of Barry Bonds. A piece by the Game of Shadows writers Mark Fainaru-Wada and Lance Williams detail the story...
When Don Regole drove 120 miles from his Tucson home to watch his beloved Diamondbacks face the San Francisco Giants in Phoenix, he brought along nine banners directed at Barry Bonds.You gotta love a good censorship story. MLB is doing such an awful job of handling everything with this case that this doesn't surprise me at all.
But Regole never got to display his banners at Chase Field on April 27. When Diamondbacks employees at the entrance to the ballpark asked to view the signs he had stuffed in his backpack, Regole was told the posters weren't acceptable. The reason: They were in poor taste.
A month later, after Regole had written the team to complain, he got a letter from the Diamondbacks. One sentence caught his attention: "As Mr. Bonds approaches the homerun record, we have been asked by Major League Baseball to carefully screen the signs that are brought into the ballpark by our fans."
SILENCING ANGRY FANS (SF Chronicle)