That said, I'm sure the death count numbers from the Rasht Massacre are staggeringly higher than the initial tallies of 2-5k.
Leftists, with Western pro-Khomeini protests, not just in Iran, with the usual involvement from the KGB, and the CIA opposing, brought Khomeini to power with claims that he would bring a communist revolution. As per tradition in a communist revolution, first thing he did once in power is execute communist allies. Of course, Iran is still allied with the KGB (now FSB) and Moscow, currently delivering weapons and weapon designs for use in the war against Ukraine.
You could also point out that Iran is kind-of socialist, in the sense that the state controls, at minimum, 70% of the economy, and all those "companies" are directly controlled by the government.
So socialists are still at it, supporting the ayatollah, for example:
https://marxist.com/iran-for-a-nationwide-uprising-down-with...
Note: yes, I get what the title says, but read. IN the article you'll find an insane rant about how Israel and the US are really behind the revolution and how despite that the regime really held back, and this popular revolution, if it fails will bring back national Iranian pride, and the revolution failing will be the final push that ayatollah's need to actually bring the communist revolution to Iran