Mobbing is a phenomenon that occurs in the organizational context and consists in hostile actions, aggression (verbal, physical, sexual), professional discredit, contempt, isolation etc. All these behaviors are performed by a person/group of persons on a person/group of people, the ultimate goal being, most times, the exclusion of individuals/group of individuals from the organization. Such behaviors are counterproductive and have long-term effects on the physical and mental health of the person assaulted. The paper describes the phenomenon of hostile action types that constitute the phenomenon of “mobbing”, its causes and effects. It also emphasizes the benefits of identifying the first signs of the emergence of this phenomenon in time.