Shahram Pourmansouri, Farhang Pourmansouri and Mehdi Zavieh are being held at the special security ward and have not been allowed to have family visits since last week.
Reports indicate several other prisoners at the security ward are also facing similar restrictions. Currently, family visits and phone contacts are not allowed in the ward, according to the Student Committee in Defense of Political Prisoners.
Security and judiciary officials have ordered to ban all visits and phone contacts for political prisoners. In response, political prisoners at the prison have launched a hunger strike, according to the students committee.