After checking this website and other, I have found that these claims come from Radio Free Asia and others citing these so I am not sure. Haven't found good sources talking about this.
Source: https://moderntokyotimes.com/new-president-of-iran-linked-to-past-executions-of-communists-socialists-and-others/
The election result in Iran for a new president is a grim reminder that ultra-conservative Shia power concentration is in full swing. This concerns the new president being linked to the mass executions of 1988. These executions exceeded several thousands of people – some site tens of thousands – when the Iranian ultra-conservative clergy sought to crush all dissent. Hence, the electoral success of Ebrahim Raisi is bound to raise questions internationally.
Is this true or can I safely dismiss it?
MEK aren't communists and they deserved it
They executed much more than just MEK
okay, so anyone else who isn't wahhabist or some crazy stuff didn't deserve it
Yea, i ain't sheding any tears for counter-revolutionaries in a relatively progressive revolution.
They were the leftists who DID the fucking revolution. The conservatives turned it into this reactionary government.
Just because you want to support Iran because of it's efforts in Palestine and such doesn't mean you have to actually support the IR