How Designating the IRGC as a Foreign Terrorist Organization Shaped U.S.-Iran Policy
The Islamic Revolutionary Guard Corps (IRGC) functions as an elite military branch of the Iranian regime that is responsible for both maintaining domestic control and expanding Iranian interests abroad through paramilitary, intelligence, and economic operations. [1] On April 8, 2019, the United States designated the IRGC as a Foreign Terrorist Organization (FTO) under Section 219 of the Immigration and Nationality Act. [2] This designation was unprecedented, as it marked the first time the United States labeled part of a foreign government, rather than a non-state group, as a terrorist organization. [3] The decision reflected a shift away from traditional counterterrorism policy toward a broader and more aggressive strategy aimed directly at the Iranian state, carrying significant legal and diplomatic implications for U.S.-Iran relations. [4]
The legal authority to designate an organization as a Foreign Terrorist Organization (FTO) is established in Section 219 of the Immigration and Nationality Act (INA). [5] This provision authorizes the Secretary of State, in consultation with the Secretary of the Treasury and the Attorney General, to make such a designation. [6] To qualify as an FTO, an organization must meet three criteria: it must be foreign, it must engage in terrorist activity or terrorism, and its actions must threaten the security of U.S. nationals or the national security of the United States more broadly. [7]
The INA further defines “terrorist activity” under § 1182 (INA § 212) to include unlawful acts such as hijacking, sabotage, hostage-taking, assassination, or the use of biological, chemical, nuclear weapons, or explosives to endanger human life or cause significant property damage. [8] This definition also encompasses threats, attempts, or conspiracies to commit such acts. [9] Separately, the Foreign Relations Authorization Act, Fiscal Years 1988 and 1989, defines terrorism as “premeditated, politically motivated violence against noncombatants carried out by subnational groups or clandestine actors.” [10]
Once an organization is designated as an FTO, the legal consequences are substantial. Providing material support to the FTO becomes a criminal offense, U.S. financial institutions are required to block transactions involving its assets, and members or representatives of the organization become ineligible for U.S. immigration and subject to deportation if already present in the country. [11]
The IRGC’s role within Iran’s military, intelligence, and economic sectors provided the basis for its designation as an FTO. To satisfy the first statutory criterion, that the group be a foreign organization [12], the U.S. government relied on the IRGC’s status as an official military organization of a foreign state, specifically one responsible for defending the regime. [13] In addition to its military and security functions, the IRGC holds significant economic influence and controls major companies in construction and engineering. [14] The U.S. government argued that the IRGC has used its resources to “bankroll terrorism,” thereby satisfying the second criterion of engaging in terrorist activity. [15] The Department of State emphasized the IRGC’s support for a proxy network that includes Hezbollah, Hamas, and Shia militias such as Kata’ib Hizballah, providing funding, weapons, and training. [16] This, along with the IRGC’s involvement in conflicts in Iraq and Syria, supported the conclusion that the organization has both the capability and intent to continue engaging in terrorist activity. [17]
Finally, the IRGC met the third criterion, as it was determined to pose a threat to U.S. nationals and national security. [18] Since 2003, the IRGC has caused the deaths of at least 603 American service members in Iraq. [19] It has also been associated with major attacks, including the 1983 U.S. Marine barracks bombing and the 1996 Khobar Towers bombing, both of which resulted in significant American casualties. [20]
The designation marked the first time the United States formally applied the FTO framework to an official branch of a foreign government. [21] Previously, this framework had been limited to non-state actors such as Al-Qaeda and Hamas. [22] By extending it to a state military entity, the United States effectively characterized a component of the Iranian government as a part of a global terrorist enterprise. [23] This shift is significant because it reflects the adoption of a “maximum pressure” strategy that uses counterterrorism law as a tool to diplomatically and economically isolate Iran. [24]
The FTO designation of the IRGC expanded the scope of the “maximum pressure” campaign by targeting a central institution within the Iranian state itself. [25] It introduced legal constraints that complicate diplomatic engagement and limit opportunities for de-escalation. [26] Because the IRGC maintains control over key sectors of Iran’s economy, including construction and energy, the prohibition on providing “material support” makes it more difficult for future administrations to offer sanctions relief in exchange for concessions, such as those related to a nuclear agreement. [27] In response, Iran labeled the U.S. Central Command a terrorist organization, which further reduced the potential for formal diplomatic engagement. [28]
More broadly, U.S. policy toward Iran shifted through the use of domestic law as a mechanism for applying economic pressure on a foreign military entity. [29] The designation triggered the application of 18 U.S.C. § 2339B, which extends criminal liability to individuals subject to U.S. jurisdiction and creates potential exposure under the Antiterrorism Act. [30] This development increased the role of federal law in efforts to disrupt Iran’s financial and logistical networks. [31]
Over time, this approach has contributed to a shift away from a strategy of “no war, no peace” toward one of regional containment. [32] By treating the IRGC’s official military activities as part of a broader global criminal threat, the United States has justified more assertive actions, including recent strikes during Operation Epic Fury that are aimed at degrading Iran’s security infrastructure and nuclear capabilities. [33] In this way, the FTO designation both redefined the legal boundaries of counterterrorism policy and established a more confrontational and legally expansive strategy for managing U.S.-Iran relations moving forward.
References
[1] Mark D. Silinsky, Iran’s Islamic Revolutionary Guard Corps: Its Foreign Policy and Foreign Legion, Expeditions with MCUP (2019), https://doi.org/10.36304/ExpwMCUP.2019.01.
[2] The State Department Designates Iran’s Islamic Revolutionary Guards Corps as a Foreign Terrorist Organization, 113 Am. J. Int’l L. 609, 609 (2019), https://doi.org/10.1017/ajil.2019.38.
[3] Id.
[4] Id.
[5] Immigration and Nationality Act, ch. 477, 66 Stat. 163 (1952) (codified as amended in scattered sections of 8 U.S.C.).
[6] Id.
[7] Id.
[8] 8 U.S.C. § 1182(a)(3)(B)(iii) (2024).
[9] Id.
[10] Foreign Relations Authorization Act, Fiscal Years 1988 and 1989, Pub. L. No. 100-204, § 140(d)(2), 101 Stat. 1331, 1347 (1987) (codified at 22 U.S.C. § 2656f(d)(2)).
[11] Immigration and Nationality Act, ch. 477, 66 Stat. 163 (1952) (codified as amended in scattered sections of 8 U.S.C.).
[12] Id.
[13] Designation of the Islamic Revolutionary Guard Corps, U.S. Dep’t of State (Apr. 8, 2019), https://2017-2021.state.gov/designation-of-the-islamic-revolutionary-guard-corps/.
[14] Kenneth Katzman, Cong. Rsch. Serv., IN11093, Iran’s Revolutionary Guard Named a Terrorist Organization (2019), https://www.congress.gov/crs-product/IN11093?s=2&r=1 (on file with Libr. of Cong.).
[15] Designation of the Islamic Revolutionary Guard Corps, supra note 13.
[16] Country Reports on Terrorism 2019: Iran, U.S. Dep’t of State, https://www.state.gov/reports/country-reports-on-terrorism-2019/iran/ (last visited May 23, 2026).
[17] Id.
[18] 8 U.S.C. § 1189(a)(1)(C) (2024).
[19] Designation of the Islamic Revolutionary Guard Corps, supra note 13.
[20] Katzman, supra note 14.
[21] The State Department Designates Iran’s Islamic Revolutionary Guards Corps as a Foreign Terrorist Organization, supra note 2.
[22] Id.
[23] Statement from the President on the Designation of the Islamic Revolutionary Guard Corps as a Foreign Terrorist Organization, The White House (Apr. 8, 2019), https://trumpwhitehouse.archives.gov/briefings-statements/statement-president-designation-islamic-revolutionary-guard-corps-foreign-terrorist-organization/.
[24] Katzman, supra note 14.
[25] Designation of the Islamic Revolutionary Guard Corps, supra note 13.
[26] Ali Jabbar Hashem & Riam Abdul-Sattar Abdul-Jabbar, US Foreign Policy Toward Iran During Joe Biden Administration, 6 J. Positive Sch. Psychol. 200 (2022), https://journalppw.com/index.php/jpsp/article/view/12073/7843.
[27] Hal S. Shapiro et al., Legal and Practical Considerations of the Trump Administration’s Designation of the IRGC as a Foreign Terrorist Organization, Akin Gump Strauss Hauer & Feld LLP (Apr. 12, 2019), https://www.akingump.com/en/insights/alerts/legal-and-practical-considerations-of-the-trump-administration-s.
[28] The State Department Designates Iran’s Islamic Revolutionary Guards Corps as a Foreign Terrorist Organization, supra note 2, at 612.
[29] Id.
[30] 18 U.S.C. § 2339B (2024).
[31] Shapiro et al., supra note 27.
[32] Brian Katulis, Alex Vatanka & Patricia Karam, Beyond “Maximum Pressure” in U.S. Policy on Iran, Middle E. Inst. (Jan. 30, 2025), https://mei.edu/publication/beyond-maximum-pressure-us-policy-iran-leveraging-regional-partners-contain-irans/.
[33] Operation Epic Fury Fact Sheet, U.S. Cent. Command (Mar. 3, 2026), https://media.defense.gov/2026/Mar/03/2003882557/-1/-1/1/OPERATION-EPIC-FURY-FACT-SHEET-260303.PDF.