They have detained children along with their parents and used tear gas outside a high school in an altercation with protesters after detaining someone. To be sure, federal agents are barely a presence in many areas, and most people have never smelled a whiff of tear gas. Agents respond only sometimes, but when they do it’s often with punches, pepper spray, tear gas and arrests. Take the recent afternoon in south Minneapolis, where dozens of protesters, some in gas masks, clashed with immigration agents in south Minneapolis. Agents responded by shoving protesters who got too close, firing pepper balls and finally throwing tear gas grenades and driving away.