Freudian Mediators are individuals who use psychoanalytic techniques to help people understand and resolve their psychological issues. They are trained in the theories of Sigmund Freud, the founder of psychoanalysis, and use these theories to help people gain insight into their unconscious motivations and behaviors. The term 'EGO' is used to refer to the conscious part of the personality, which mediates between the demands of the id, the unconscious desires, and the superego, the moral conscience. Therefore, EGO is an appropriate four-letter solution for this crossword puzzle.