The purpose of this study was to determine the relationship between group cohesiveness and the aggression behavior of PSHT members. Behavior of aggression is a behavior perpetrated by individuals in the form of attacking and defending themselves from the opponent attack. Group cohesiveness is the individual's interest towards the group based on mutual mutuality mutuality mutual motivation to generate motivation to unite, cooperate, persist and compose in the group The total number of subjects in this research process is 99 people, used to use outskaladansaat penjelitian, subjectpadapetapan in is a member of PSHT who memlikirakiusia 18-21 tahun.Penentuan number of subyekberdekpurekive sampling techniques. Research uses a quantitative approach to analyze and prove the hypothesis of research. Pearson Corelation analytics using a computer programming software for softwareSPSS 17.0 for windows, with a significance of 0.050. Based on the data obtained, the coefficient of correlation (rxy) = 0,986 with significance p = 0,000 (p <0,050). From the results show that the existence of a positive relationship is significant and the members of the group's behavior is the behavior of the members of PSHT.

Keywords: group cohesivity, Agresion Behavior, PSHT