NEWNAN, Ga. — A heavily militarized police force of some 400 officers aggressively patrolled a small neo-Nazi rally in this city 40 miles southwest of Atlanta on Saturday and arrested about 10 counterprotesters, many for the crime of wearing a mask. Police officers arrived before the rally began and approached a group of about 50 anti-fascist protesters. They demanded the protesters remove their masks or face arrest. The officers — who wore bulletproof vests and helmets, and carried semi-automatic rifles — cornered the anti-fascist protesters, then grabbed those who were still masked, tossing them to the ground and handcuffing them....