"Kata'ib Hezbollah is one of the biggest and most vicious and dangerous Iraqi militia and terror groups," said Shahin Gobadi, spokesman for the Iran opposition organization People's Mujahedeen of Iran (MEK).
Iran militia to attack Americans after ISIS defeat in Iraq →
The MEK's Mr. Gobadi said Iran's political prisoners have stepped up criticism in recent months "regarding the deteriorating and dreadful conditions" at Gohardasht and other prisons.
Iran's political prisoner treatment raises human rights alarm →
