That was "Insulin Shock Therapy" which had no actual solid support - certainly nothing that would withstand modern scrutiny - and frequently included "improvement" in schizophrenic patients that were clearly docility caused by direct neurological damage.
You also don't just get "hooked up to an ect machine" - it's well established that ECT as used historically was almost entirely aversion therapy - modern ECT does not ever occur on a conscious patient, and because of how it was used historically there are extremely strict controls on patient consent and patient awareness of what they are consenting to - all questionnaires, surveys, consents, etc are taken by a third party that is not part of the treatment.
You also don't just get "hooked up to an ect machine" - it's well established that ECT as used historically was almost entirely aversion therapy - modern ECT does not ever occur on a conscious patient, and because of how it was used historically there are extremely strict controls on patient consent and patient awareness of what they are consenting to - all questionnaires, surveys, consents, etc are taken by a third party that is not part of the treatment.