Park Avenue, Central Beijing, is known for its luxurious serviced apartments, landscaped gardens and Western-style amenities, certainly not its dissident population. Yet, strolling past the compound one weekend, I was surprised to see a protest in progress. A small group of around two dozen had assembled with signs and were milling around outside a locked shop, arguing with a harassed-looking man in the Chinese junior-management uniform of white shirt and belted black trousers. The cause