Here's an expose by Jon Wiener in The Nation about how the tobacco industry uses the judicial system to prevent historians from publishing material that reveals how the tobacco industry deceived the public about their product. Big Tobacco and the Historians.

Excerpt: On the stand [historian Robert] Proctor began to explain racism in tobacco marketing. He started to say that the companies had marketed products called Nigger-Head Tobacco and Nigger-Hair Tobacco--brands that existed as late as the 1960s. But a Philip Morris attorney, objecting that Proctor had injected racial slurs into the courtroom, demanded a mistrial--and got it.