Examples of espionage in the following topics:
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- ensuring the resilience and redundancy of critical infrastructure; using intelligence services to detect and defeat or avoid threats and espionage, and to protect classified information;
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- New media has also recently become of interest to the global espionage community as it is easily accessible electronically in database format and can therefore be quickly retrieved and reverse engineered by national governments.
- Particularly of interest to the espionage community are Facebook and Twitter, two sites where individuals freely divulge personal information that can then be sifted through and archived for the automatic creation of dossiers on both people of interest and the average citizen.
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- The Espionage Act of 1917 and the Sedition Act of 1918 imposed restrictions on free press during wartime.
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- During World War I, individuals petitioning for the repeal of sedition and espionage laws were punished—again, the Supreme Court did not rule on the matter.