The 150 workers were fired following demonstrations at the Tehran Refinery when workers protested four months of unpaid wages.
A source speaking to Iran International said they have now been blacklisted by the refinery, barring them from any future employment there.
The Ministry of Intelligence has reportedly pressured the welders, demanding they identify individuals who shared footage of the strike with the media, the source added.
Additionally, Etemad newspaper reported that 15 representatives of third-party contract workers in Iran's oil industry are also facing dismissal for advocating for improved wages and benefits for the estimated 120,000 workers they represent.
The representatives were referred to the supervisory body and have since been summoned for questioning. Two have already been formally dismissed, five are awaiting dismissal orders, and eight others are awaiting summons.
The contract workers have been demanding wage standardization and benefits comparable to employed workers, including shopping vouchers, loans, and access to recreational facilities, since 2022.
Thousands of them held multiple protests in 2022 and 2023 leading to summons and interrogations but failing to achieve any significant changes in their working conditions.