https://en.wikipedia.org/wiki/Pite%C8%99ti_Prison

First stage

Each subject of the experiment was initially thoroughly interrogated, with torture applied as a mean to expose intimate details of his life ("external unmasking").[22] Hence, they were required to reveal everything they were thought to have hidden from previous interrogations; hoping to escape torture, many prisoners would confess to imaginary misdeeds.[18]

Second stage

The second phase, "internal unmasking," required the tortured to reveal the names of those who had behaved less brutally or with relative indulgence to them in detention.[22]

Third stage

Public humiliation was also enforced, usually at the third stage ("public moral unmasking"),[22] inmates were forced to denounce all their personal beliefs, loyalties, and values. Notably, religious inmates had to blaspheme religious symbols and sacred texts