The development comes after the killing of a number of members of the Revolutionary Guard.
In recent years, Iranian intelligence officers have tricked a number of overseas activists into travel to destinations where they were kidnapped and sent back to Iran, US authorities said.
FBI agent Robert Levinson disappeared in Iran under mysterious circumstances more than a decade ago.
The leaked Iranian cables show that Iran has outmanoeuvred the US in Iraq, but the tragedy is that Iraqis are perpetual victims of imperialism.
Members of Iran’s intelligence agency worked to co-opt Sunni fighters in the battle against ISIS, and rued lack of cooperation with the US, according to reports.
Israel is using Iraq as a staging ground for its proxy battles with Iran - and Iraq can do nothing to stop it.
An Iranian official claimed that the CIA spies had "sophisticated training," but none of them succeeded in their sabotage missions. US Secretary of State Mike Pompeo responded by saying Iran has a history of lying.
Monica Elfriede Witt is charged with revealing classified information to Tehran, including details of secret operations and agents' personal and professional lives.
Abdul Hamid S, who was working as a linguistic and cultural adviser with the German army, "is believed to have passed insights to an Iranian intelligence agency," prosecutors say.
Gonen Segev, energy minister from 1995 to 1996, made contact with Iranian officials at the Iranian embassy in Nigeria in 2012 and he also visited Iran twice for meetings with his handlers.
A freeze on their funds and assets will take effect on Wednesday once their names are published in the EU's official journal.
The move came after Danish intelligence agency said the Iranian intelligence service "was planning an attack in Denmark" against three Iranians suspected of belonging to the Arab Struggle Movement for the Liberation of Ahvaz.
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