Analysis: Why Iran Seized the British Marines

The most ominous detail about Iran's seizure of 15 British Royal Marines in the Shatt-al-Arab waterway on Friday morning is that the servicemen were reportedly taken into custody by the navy of the Iran's Islamic Revolutionary Guard Corps (IRGC). The IRGC is a powerful, separate branch of the Iranian armed forces. Soaked with nationalist ideology, it has grown into a state within a state in Iran, with its own naval, air and ground forces, parallel to official government institutions. The IRGC is directly controlled by Supreme Leader Ayatullah Ali Khamenei, the ultimate font of religious and political power in Iran. The IRGC also has its own intelligence arm and commands irregular forces such as the basij — a voluntary paramilitary group affiliated with President Mahmoud Ahmadinejad — and the Quds force, which has been accused by the U.S. of supplying material to Iraqi insurgents bent on killing American soldiers. The IRGC is also known for its clandestine activities including logistical support for militant organizations like Lebanon's Hizballah, which it helped to set up in the 1980s, and several Shi'a militia groups in Iraq. The IRGC's activities are often a thorn in the side of Iran's Foreign Ministry, which is forced to repair the ruptures in Tehran's diplomatic relations with countries the Guard has inflamed with its self-directed adventures. Nevertheless, it has been one of Iran's main instrument in projecting power and influence over the last few decades.

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