What was crucifixion usually reserved for?

Crucifixion was typically reserved for the most severe crimes, particularly those considered treasonous or insurrectionary, such as rebellion against the state or challenging the authority of the Roman Empire. It was often used as a punishment for slaves, pirates, and non-Roman citizens, serving as a public deterrent against dissent. The method was designed to be a slow and agonizing death, meant to humiliate and instill fear in others.