Mass surveillance in North Korea is when the government watches what people say and do. The government uses cameras and microphones to listen to people's conversations, look at their activities, and track their movements. This is done to make sure people are following the strict rules of the country and not speaking out against the government. North Korea also uses its internet and phone networks to keep track of its citizens. The government is able to read emails, text messages and phone calls in order to get information they need. All of this is done in order to make sure everyone is following the rules of the government.