1988 executions of Iranian political prisoners
Amnesty International , after interviewing dozens of relatives , puts the number in thousands; and then-Supreme Leader Ruhollah Khomeini's deputy , Hussein-Ali Montazeri put the number between 2 , 800 and 3 , 800 in his memoirs , but an alternative estimation suggests that the number exceeded 30 , 000 . 
<triplet> Ruhollah Khomeini <subj> Supreme Leader <obj> position held <triplet> Hussein-Ali Montazeri <subj> Ruhollah Khomeini <obj> student of