The word "dissident" refers to a person who strongly disagrees with or opposes the government or an established authority. They usually express their disagreement through public criticism or activism. Full definition
However, there soon developed a small opposition consisting of dissident members of the Hudson River Conservation Society and Leo Rothschild, the conservation chair of the New York - New Jersey Trail Conference. (dotearth.blogs.nytimes.com)
from Reuters: BEIJING Fri Jun 24, 2011 6:34 am EDT (Reuters)- No talking, no tweeting and no travel for a year — these are some of the conditions of Chinese dissident artist Ai Weiwei's release from more than two months in detention, underscoring Beijing's efforts to muzzle dissent. (miamiartexchange.com)
An exhibition marrying the work of Ai Weiwei, the world - famous Chinese political dissident artist, and Alcatraz, the notorious federal «ghost» prison with spectacular vistas of San Francisco Bay. (parksconservancy.org)