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The word boycott is being used quite a lot at the moment following the events in Tibet and China. Its origin is very interesting:

Charles C. Boycott seems to have become a household word because of his strong sense of duty to his employer. An Englishman and former British soldier, Boycott was the estate agent of the Earl of Erne in County Mayo, Ireland. The earl was one of the absentee landowners who as a group held most of the land in Ireland. Boycott was chosen in the fall of 1880 to be the test case for a new policy advocated by Charles Parnell, an Irish politician who wanted land reform. Any landlord who would not charge lower rents or any tenant who took over the farm of an evicted tenant would be given the complete cold shoulder by Parnell’s supporters. Boycott refused to charge lower rents and ejected his tenants. At this point members of Parnell’s Irish Land League stepped in, and Boycott and his family found themselves isolated—without servants, farmhands, service in stores, or mail delivery. Boycott’s name was quickly adopted as the term for this treatment, not just in English but in other languages such as French, Dutch, German, and Russian.

(American Heritage® Dictionary of the English Language)