I had written earlier that in this video, demonstrators were chanting "Death to Khameini's son!" Mojtaba Khameini is the son of Supreme Leader Ayatollah Khameini, and he is also head of the Basij militia who have been at the lead in committing crimes against the Iranian people.
Apparently, the actual translation is more elaborate:
"Mojtaba, we hope you die before you get the supreme leadership!"