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This study to aim Investigate the relationship between organizational effectiveness supportive leadership and oppressive styles. The current research is correlative and descriptive due to its nature. For this study, 400 samples were considered. After distributing and collecting questionnaires, 20 valid questionnaires for analysis were diagnosed, so research sample group was reduced to 380 persons. The sample randomly sampled based on a list of employees. The sample randomly sampled based on a list of employees. To collect log data, organizational effectiveness, leadership oppressive questionnaire, a questionnaire ethical leadership, supportive leadership questionnaire was used.Data analysis in two levels of descriptive statistics and inferential statistics was performed using SPSS software. According to the result of the relationship between leadership styles (moral, oppressive and support) with dimensions of organizational effectiveness (effectiveness of individual results, effectiveness and efficiency of the overall structure and system), there is a significant relationship
Key words: leadership styles, oppressive leadership, organizational effectiveness, supportive leadership,
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