The delegates to the G-20, the gathering of the world’s wealthiest nations, will consequently be protected by a National Guard combat battalion, recently returned from Iraq. The battalion will shut down the area around the city center, man checkpoints and patrol the streets in combat gear. Pittsburgh has augmented the city’s police force of 1,000 with an additional 3,000 officers. Helicopters have begun to buzz gatherings in city parks, buses driven to Pittsburgh to provide food to protesters have been impounded, activists have been detained, and permits to camp in the city parks have been denied. Web sites belonging to resistance groups have been hacked and trashed, and many groups suspect that they have been infiltrated and that their phones and e-mail accounts are being monitored.