An arrest that was made occurred on a side street near Baum Ave & S Millvale Ave. Video can be seen online. Unmarked car with US military personal arresting Americans in public should raise concern. The "Group of 20" is meeting today and tomorrow in Pittsburgh. People have been demonstrating to counter the G20, a group of the richest, most powerful people from the richest, most powerful countries who make decisions which impact all of us. The past few times they have met they decided to bail out big banks, including the biggest, baddest bank of them all, the International Monetary Fund (IMF), which does nothing to help people. In addition, G20-style globalization policies have harmed the environment and threatened democracy everywhere. Demonstrators went on the march through Pittsburgh without a permit, and police tactics effectively split up the group after about 45 minutes of marching. In the end only about 26 arrests were made. National Guard, police, and other military units attacked American citizens with tear gas and deployed sound cannons today in response to an ?unpermitted protest? as bedlam hit the streets on the first day of the G20 summit in downtown Pittsburgh. 2,500 National Guardsmen along with Marines and the Air Force are stationed in Pittsburgh to provide ?security? for the G20 summit. Their primary training routine revolved around ?crowd control? and dealing with civil unrest. The sight of troops on the streets of America, even for routine traffic control and ?security? is now commonplace as the land of the free sinks into a militarized police state. The Posse Comitatus Act is a United States federal law (18 U.S.C. § 1385) passed on June 18, 1878, after the end of Reconstruction, with the intention (in concert with the Insurrection Act of 1807) of substantially limiting the powers of the federal government to use the military for law enforcement. The Act prohibits most members of the federal uniformed services (today the Army, Air Force, and State National Guard forces when such are called into federal service) from exercising nominally state law enforcement, police, or peace officer powers that maintain "law and order" on non-federal property (states and their counties and municipal divisions) within the United States. where expressly authorized by the Constitution or Congress.