The core control of key personnel refers to

Controllers refer to those who are recorded by the public security organs in accordance with regulations, including those involved in terrorism, stability, drugs, fugitives, people with major criminal records, mental patients who make troubles, key visitors and other people who need local attention.

During the epidemic period, the key population refers to the staff of key places and institutions, people with high infection risk or low resistance, including medical personnel, front-line personnel of entry and exit, customs and market supervision systems, police, sanitation workers, security guards, cleaners, port transport practitioners, couriers, water and electricity workers, home isolation medical observation or home health monitoring personnel, rescuers in local epidemic areas, epidemic prevention and control personnel, vagrants and beggars, etc.