Final answer:
Defendants found incompetent to stand trial prior to 1972 were generally institutionalized. This was due to historical mismanagement of mental illness, which evolved with new legal standards for competency and due process.
Step-by-step explanation:
Prior to 1972, defendants found incompetent to stand trial due to mental illness or incapacity typically faced institutionalization. This practice stemmed from a long history where mental illness was not adequately understood or treated, often leading to individuals being held in asylums or prisons without proper care. This approach changed over time, especially following landmark decisions that established the rights of defendants to competency evaluations and due process.