They jammed up Azadi Avenue and Jayhoon Street leading to the building where the ministry is located.
The demonstrators carried large banners reading, "We want the government to expedite transfer of our factory back to the government sector."
Also they demanded that they should be reimbursed by the government for the months they were not paid.
Nearly 1,200 workers walked out on April 12 for the first time when the hand picked management called in the SSF to crush their demonstration. A number of the workers were arrested in that incident.
The mullahs' inhuman regime, fearing the spread of the move, rushed hundreds of the SSF agents to the scene to suppress the strikers. However, the local residents and youths clashed with the SSF units in support of the striking workers. They threw stones and sticks at the security forces.
It has been one of the longest strikes by the workers in the country. Kiyan-Tire is only second to that of the Sugar Cane factory workers in the southwestern city of Shoosh in which more than 5,000 workers are still on strike over their unpaid salaries since last year.
In August alone nearly 140 workshops and factories went on strike over payments. Factories such as Haft-Tapeh sugar cane mills, Kiyan-Tire making car tires, Iran Khodro car manufacturer are some of the biggest with tens of thousands of workers.
In the past decade, most of Iran's factories have been privatized by the mullahs' regime opening the doors to even more suppressive measures against the Iranian workforce. The new managements were appointed by the government without adequate protection for workers and their families who make the most venerable part of the population.