Psy* (psychology, psychiatry etc) is neither a science nor a medicine. If your only issue with Soviet regiment is intential usage of psy* pseudoscience then try to search about the Rosenhan experiment.

There is neuroscience though which is a science and can prove things like depression and schizophrenia exist (many distinct kinds of both, possible to distinguish using MRI). Sadly there aren't many neuroscientists and MRI machines available to general public so we still have to rely on psychiatrists for help when our neural system goes awry. In many cases they actually help.