Contemporary organizations need a workforce who can work more enthusiastically to compete in the market. This study synthesizes leadership paradigms for the purpose of exploring possible ways of influencing organizational citizenship behaviors to increase the functioning of organizations. Further, we test for the underlying mechanisms, psychological contract fulfilment between leadership style and employees organizational citizenship behaviors. In addition, we examined for the moderating role

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... trust in leader between leadership style and organizational citizenship behaviors. Collecting data from 436 employees from the agriculture sector organizations in Morocco, we found that abusive leadership has a negative relationships with organizational citizenship behaviors. Using SPSS and AMOS as a statistical tools, our findings further confirms the mediating roles of psychological contract fulfilment between the relationship of abusive supervision and employees organizational citizenship behaviors. Furthermore, the results of the current study also suggests an important role of trust in leader as a boundary specificity of the relationship between abusive supervision and organizational citizenship behaviors. At the end, this research presents several important implications, which truly enrich our understanding regarding abusive supervision and employees organizational citizenship behaviors.