TORONTO  Iran’s most senior cleric denounced the role of the volunteer militia force known as the Basij in the crackdown against protesters, saying the force’s actions were against religion and “in the path of Satan.”

The cleric, Grand Ayatollah Hossein Ali Montazeri, condemned the force in a statement posted on an opposition Web site, mowjcamp.com, decreeing that “the assailants have acted against religion and must pay blood money” to those who were wounded or to their families.

It was the harshest criticism of the militia to date by the ayatollah, who has sided with the opposition leaders. The Basij militia has played an instrumental role in the crackdown; the opposition has said that at least 73 people have been killed since the post-election protests began in June.

The opposition is planning another demonstration on Dec. 7, known as Student Day. Dozens of student leaders have already been arrested.