The Justice Department is no ordinary agency. Its 93 United States attorney offices, scattered across the country, prosecute federal crimes ranging from public corruption to terrorism. These prosecutors have enormous power: they can wiretap people’s homes, seize property and put people in jail for life. They can destroy businesses, and affect the outcomes of elections. It has always been understood that although they are appointed by a president, usually from his own party, once in office they must operate in a nonpartisan way, and be insulated from outside pressures.

This understanding has badly broken down. It is now clear that United States attorneys were pressured to act in the interests of the Republican Party, and lost their job if they failed to do so. The firing offenses of the nine prosecutors who were purged last year were that they would not indict Democrats, they investigated important Republicans, or they would not try to suppress the votes of Democratic-leaning groups with baseless election fraud cases.