The haste to execute was so abhorrent that some of Khomeini’s closest confidantes, most notably, Hossein Ali Montazeri, Khomeini’s heir apparent, had doubts and protested it. In letters to Khomeini, Montazeri urged for some leniency and slowing down. But Khomeini ordered there should be mercy for no one, including teenagers. He said pregnant women should not be spared or have the chance to give birth to their child and should be executed immediately.

In December 2000, Montazeri published his memoirs. The book revealed shocking documents on the atrocities committed by the clerical regime, none as horrendous as the massacre of 30,000 political prisoners in 1988 on the orders of Khomeini.

Montazeri’s book was not the first document informing the world of this massacre. News of the carnage had already begun to trickle through the iron curtain of censorship imposed by the mullahs to ensure a complete blackout on their crime.

On August 9, 2016, relatives of Hossein-Ali Montazeri, Khomeini’s former heir, published a shocking audio tape in which Montazeri can be heard telling a meeting of members of the “Death Committee” 28 years ago (August 15, 1988) that they are carrying out a crime against humanity. The Montazeri tape revealed new information about the scope and breadth of the massacre of political prisoners at the time. It has sent shockwaves in Iran and in particular among the regime’s officials who had for more than two decades attempted to impose an absolute silence on the massacre.

The clip also showed that the Iranian regime’s leaders who held positions of power since the beginning of the regime’s establishment must face justice for committing one of the most horrific crimes against humanity.

International assessment

There has been little international attention to this crime against humanity.

In 2008, twenty years after the massacre Amnesty International “renewed its call for those responsible for the ‘prison massacre’ to be held accountable. There should be no impunity for such gross human rights violations, regardless of when they were committed.” Amnesty added: “Those responsible for the killings – one of the worst abuses to be committed in Iran – should be prosecuted and tried before a regularly and legally constituted court and with all necessary procedural guarantees, in accordance with international fair trial standards.”

Justice not yet served

The massacre of 1988 remains to be one of the darkest stains on the recent history of mankind, as one of the least exposed and discussed.

Some human rights experts have described it as the greatest crime against humanity in the 20th Century following World War II that has gone unpunished.

It is the darkest irony of this very dark episode, that of all its human rights violations the Iranian regime has been most successful at keeping the 1988 killings a secret from the international community and even from many Iranians. By now, virtually everyone knows of the reign of terror that immediately followed the Islamic Revolution, the Iranian government’s assassination campaign abroad, and the “Chain Murders” that targeted opposition intellectuals and activists in the late 1990s. Tragically, however, there is very little public awareness of the 1988 executions.

Not only has there been no prosecution of the criminals who orchestrated and carried out that summer’s gruesome murders, but the regime continues to deny that they even occurred.

The Iranian regime continues to deny the 1988 elimination of opposition prisoners. None of the perpetrators or masterminds have been brought to justice and none of the regime’s senior officials including the current Supreme leader, Ali Khamenei, have been held accountable.

The pervasive silence of the past 28 years should be shattered. The UN should launch an independent investigation into one of the most hideous crimes against humanity after the Second World War.