The Espionage Act of 1917 is a United States federal law enacted on 15 June 1917, approximately two months after the United States entered World War I. It prohibits obtaining, transmitting, or losing information related to national defense with the intent or reasonable belief that it could be used to harm the United States or benefit a foreign nation. The Act also criminalizes interference with military recruitment and operations, as well as insubordination within the armed forces. Despite its wartime origins, the Espionage Act remains in force and has been applied in peacetime to journalists, government employees, intelligence contractors, and political figures accused of mishandling or leaking classified information.

The Espionage Act was passed during the administration of President Woodrow Wilson as part of a broader legislative effort to suppress dissent and protect military operations during wartime. Its 1918 amendment, known as the Sedition Act, extended its reach to speech critical of the government, though the Sedition Act was repealed in 1920. The Espionage Act survived and was amended at various points throughout the twentieth century. Early prosecutions targeted socialist and labor activists, most notably Eugene V. Debs, who was convicted in 1918 for a speech opposing the draft. The Supreme Court upheld the Act's constitutionality in Schenck v. United States (1919), in which Justice Oliver Wendell Holmes articulated the “clear and present danger” standard. For a fuller treatment of its development, see Espionage Act - History.

The Act is codified primarily at 18 U.S.C. §§ 793-798. Section 793 addresses gathering, transmitting, or losing defense information; Section 794 addresses transmitting such information to a foreign government; Section 798 specifically targets cryptographic and communications intelligence. The Act does not require proof of intent to harm the United States in all provisions - some sections require only that the defendant had reason to believe the information could be used against the country. Notably, the Act contains no explicit exemption for journalists, whistleblowers, or members of Congress, a feature that has generated substantial legal and policy debate. The Act also does not use the word “classified,” applying instead to “national defense information,” a broader category not defined entirely by the executive classification system.

The Espionage Act has been used in prosecutions spanning several eras and contexts:

• World War I era: Eugene V. Debs, labor leader and Socialist Party candidate; anarchists Emma Goldman and Alexander Berkman
• Cold War era: Julius and Ethel Rosenberg, convicted of conspiracy under the Act and executed in 1953; Alger Hiss (convicted of perjury in a related matter, not directly under the Act)
• Vietnam era: Daniel Ellsberg, charged in connection with the Pentagon Papers leak; charges were dismissed in 1973
• Post-9/11 era: Thomas Drake, John Kiriakou, Jeffrey Sterling, and others prosecuted as part of a significant expansion of leak prosecutions
• Recent era: Chelsea Manning, convicted in 2013; Edward Snowden, charged in 2013 (fled to Russia); Reality Winner, convicted in 2018; Jack Teixeira, charged in 2023; and former President Donald Trump, indicted in 2023 on charges related to classified documents retained after leaving office

The Obama administration prosecuted more individuals under the Espionage Act than all previous administrations combined. Subsequent administrations have continued to employ the statute.

Several aspects of the Espionage Act are subjects of active legal, political, and scholarly dispute:

First Amendment conflict: Critics argue the Act, as applied to leakers and journalists, conflicts with constitutional press freedoms and the public's interest in government accountability. Defenders argue national security information falls outside ordinary First Amendment protection. See Espionage Act - First Amendment Debate.

The absence of a public interest defense: Unlike some foreign equivalents, U.S. law provides no statutory defense for leaking information that reveals government wrongdoing. Whether such a defense should exist is contested. See Espionage Act - Whistleblower Debate.

Selective and politicized enforcement: Some analysts contend the Act has been applied inconsistently, protecting high-ranking officials while prosecuting lower-level leakers. Others argue enforcement reflects legitimate prosecutorial discretion. See Espionage Act - Enforcement Debate.

Application to former officials and politicians: Prosecutions involving current and former elected officials or political appointees raise questions about the Act's intersection with separation of powers and executive privilege. See Espionage Act - Political Prosecution Debate.

• National Security Priority-viewpoint - The Act is a necessary tool for protecting intelligence sources, methods, and operational security in an era of sophisticated adversaries.
• Civil Libertarian-viewpoint - The Act's breadth and its use against journalists and whistleblowers represents an unconstitutional suppression of speech and press freedom.
• Reform Advocate-viewpoint - The Act should be modernized to include a public interest defense, clearer definitions, and protections for good-faith disclosures of government misconduct.
• Originalist / Strict Constructionist-viewpoint - Courts should interpret the Act narrowly according to its text and original public meaning, limiting prosecutorial overreach.

• Espionage Act - History
• Espionage Act - Debate
• Espionage Act - First Amendment Debate
• Espionage Act - Whistleblower Debate
• Espionage Act - Enforcement Debate
• Classified Information
• Sedition Act of 1918
• Freedom of the Press
• National Security Whistleblowing
• Progressive Era

1. Espionage Act of 1917, Pub. L. 65-24, 40 Stat. 217 (1917), codified as amended at 18 U.S.C. §§ 792-798.
2. Schenck v. United States, 249 U.S. 47 (1919).
3. Debs v. United States, 249 U.S. 211 (1919).
4. Geoffrey R. Stone, Perilous Times: Free Speech in Wartime (W.W. Norton, 2004), pp. 147-195.
5. Scott Shane, “Obama's Crackdown Views Leaks as Aiding Enemies of U.S.,” New York Times, 20 June 2012.
6. United States v. Manning, Army Court of Criminal Appeals, 2013.
7. United States v. Trump, S.D. Fla., Case No. 23-cr-80101 (2023).
8. Leonard Downie Jr. and Sara Rafsky, “The Obama Administration and the Press,” Committee to Protect Journalists, 10 October 2013.