FERGUSON, Mo. (Reuters) - Four white men carrying military-style rifles and sidearms added a disquieting element to riot-torn Ferguson, Missouri, when they began patrolling the streets before dawn on Tuesday, which police quickly labeled "inflammatory." The men said they were part of a group called "Oath Keepers," which describes itself as a non-partisan association of current and former U.S. soldiers, police and first responders who aim to protect the U.S. Constitution. They told reporters on the street that they were in Ferguson to protect a media organization. The men attracted immediate attention in the mostly black neighborhood, which exploded into...