This chapter shows that, in the absence of bureaucratic institutions, courts were the primary institutions by which central political authorities could enforce law and policy in localities. The courts, in turn, were local institutions under local control in every colony except, perhaps, Pennsylvania. In many colonies juries that determined both law and fact used their power to nullify legislation and other commands of central government. In other colonies, county courts were self-perpetuating bodies whose judges felt free to ignore the commands of appellate courts and other central authorities. Other colonies were so small that power was necessarily local in nature. Pennsylvania was the only large colony in which the Supreme Court controlled the work of lower courts, but its authority was also under challenge.