It's important to keep in mind of things that could happen.
Types of surveillance
Physical surveillance - spies and intruders. Historically the only form of surveillance humanity knew. Things change over time. Communication methods change along with the means of interception.
Signals interception - Electronic means of gathering information.
Dataveillance - collection and analysis of personal information about individuals.
If you see say something!
The foundation of dataveillance was first used by the NAZIs. A punch card system was developed by a company known as Dehomag. A subsidiary of IBM. This kept tabs on all individuals and cataloged them accordingly.
STASI like behavioral methods require many informers and collaborators. Using fear
and active retribution to maintain its grip on all thoughts and behavioral attitudes.
Extreme examples of surveillance: STASI and NAZI methods of control. Paying closer attention to everyone around you. Illiciting conflicting behaviors in the population. Paranoid in nature with an intent on destroying common trust, repect, and decency in the community.
They kept tabs on telephone conversations, opened the mails, checked the trash for illegal goods, even typewriters were kept track of. All the typeset was 'fingerprinted' in their file networks.
Technology has always played an important part. Collecting, maintaining, and accessing information about individuals has become easier than ever. With the all seeing eyes and hearing ears of godlike tech keeping tabs on everyone in every way imaginable it makes it easier to do social experiments on a grand and epic scale.