The Islamic Iran Participation Front published the letter on the Norooz website on September 12 after a worsening in the condition of jailed top member Mohsen Safaie Farahani.
Safaei Farahani was arrested shortly after the June 2009 presidential election and released on bail after spending several months in jail. He was recalled to Evin prison after filing a complaint with six other reformists against the (IRGC) for its alleged "interference" in the presidential election.
Safaei Farahani's wife, Efat Khatibi, told RFE/RL on September 11 that her husband had a heart attack in Ward 350 of Tehran's notorious Evin prison but has been denied medical care.
Addressing the IRGC commander, the letter states that "now that Safaei Farahani has been deprived of even the most basic medical treatment, you should know that you are the first-rank authority responsible for all these oppressions and catastrophes and should be held accountable sooner or later."
The Islamic Iran Participation Front said the letter was addressed to Jafari because the military institution he commands has not only had the foremost role in Iran's postelection events, but is also currently the final decision maker about the prisoners detained in the course of Iran's Green Movement.
The Islamic Iran Participation Front is the dominant member of the 2nd of Khordad Movement, the reformist coalition in parliament that is made up of several progressive political parties.