Sanctuary city laws were largely driven by local law enforcement and community services agencies and the way fear of being targeted (personally, or family, or community members) by immigration authorities in the event of law enforcement or other government contact complicated enforcement of local enforcement of non-immigration laws and delivery of local services in communities with significant immigrant populations; mitigating that fear related to contact with local government and leaving enforcement of federal law to federal authorities improved the ability of local governments to serve their own priorities.