def the carrows
like yes, lockhart didn't know anything abt what he was teaching and umbridge was a total jerk but the carrows made students use the cruciatus curse on first years and also used the cruciatus curse themselves on students (along with other punishments such as beating or cutting)
umbridge did also cut the students in detention and almost used the cruciatus curse on students but the carrows actually performed the curse and were just way worse in general so