Answer:
Expropriation
Step-by-step explanation:
The government of the last Shah of Iran, Mohammad Reza Pahlavi, was a pro-western government that allowed the existence of U.S. owned assets in Iran.
When he was overthrown, different rival factions waged for power for a few months until the islamists led by Ruhollah Khomeini finally took power.
Khomeini was fiercely anti-west, and also, anti-Soviet Union. He referred to the U.S. as the "great satan", and the Soviet Union as the "second-satan".
Shortly after becoming the supreme leader of Iran, Khomeini expropiated all U.S. assets in Iran.