I was under the impression that the basij were secret police? So, they are basically just gov't goons??
Excerpt...
Paramilitary, subordinate to, and receive orders from Iranian Revolutionary Guards and Khamenei. Currently Basij serve as an auxiliary force engaged in activities such as internal security as well law enforcement auxiliary, ... and the suppression of dissident gatherings. They have a local organization in almost every city in Iran.
I think they are also what the Iranians refer to as “plain clothes” in their tweets - but I could be wrong on that.