Final answer:
The specific country that banned Miller's works after his campaigning for dissident writers is not explicitly stated in the provided references, therefore cannot be definitively answered. However, the texts provided do discuss the broader theme of suppression and censorship in various countries, including during the era of McCarthyism in the United States.
Step-by-step explanation:
The country that banned Miller's works after he campaigned for the freedom of dissident writers was not explicitly stated in the provided references. However, by extrapolating from historical context, during the Cold War, many countries were known to censor and suppress dissent, particularly those with authoritarian regimes. Although we know McCarthyism in the USA led to the blacklisting of many artists and intellectuals, including Arthur Miller, due to their supposed communist sympathies, the specific instance of a country banning Miller's work in response to his campaigning is not commonly cited. Without a clear reference, it's essential not to speculate which country did so. Instead, we can discuss the broader issue of censorship and suppression of freedom of the press and speech in various countries, as highlighted by the examples of Tanzania, Belarus, and others more generally in the provided text.