Alger Hiss was an American government official accused in 1948 of having spied for the Soviet Union in the 1930s. The statute of limitations had expired for espionage, but he was convicted of perjury in connection with this charge in 1950. Before the trial Hiss was involved in the establishment of the United Nations, both as a US State Department official and as a UN official. In later life, he worked as a lecturer and author.

Espionage, spying, or intelligence gathering is the act of obtaining secret or confidential information (intelligence). A person who commits espionage is called an espionage agent or spy. Any individual or spy ring, in the service of a government, company, criminal organization, or independent operation, can commit espionage. The practice is clandestine, as it is by definition unwelcome. In some circumstances, it may be a legal tool of law enforcement and in others, it may be illegal and punishable by law.