The writers of our Constitution placed their faith not in specific guarantees of rights—those came later—but in a system of checks on government power. Foremost is the separation of powers among the three branches of the federal government, as well as between the federal government and the states. For this system to work as designed, people in each branch of the federal government and in the state governments must do their jobs and stay in their respective lanes. But what happens when district attorneys—members of their states’ executive branches—refuse to execute the laws of the land? We are witnessing the results today in blue cities across America.