Ai Weiwei also is one of the most famous Chinese dissidents. His conflict with the government in Beijing attracts wider interest in the global media. CNN calls the activist "a perpetual thorn in the Chinese government's side" (cnn.com).
Apparently the activist also has fans in the New York street art scene. On some streets in the Lower East Side (Bowery, Prince Street, Spring Street) you can find some spray work regarding to Ai Weiwei´s political conflict.
I am not sure if his situation is so dramatic as the murals suggest and that the campaign will really help him. But at least these pieces of art look funny and are an enrichment of the already gaudy street art environment in Southern Manhattan.