In this study, it is aimed to reveal the political and legal steps of the interventionists and different segments of the society and the public opinion to base the intervention on a legitimate basis with in the framework of the developments occuring before and after 27th May Military Intervention. Immediately after 27th May Military Intervention took place, many practices in the last period of the Democrat Party goverment turned into a propaganda in Turkish public opinion to contribute to justification of the intervention. After this step, military interventionists took political and legal steps to base the intervention on the ground of revolution. Actually, this situation is nothing more than policies in order to legitimize the military intervention. In this study, the steps taken by perpetrators of 27th May incident to base the intervention properly on the basis of legitimacy are discussed in the light of press, copyrights, studies, memoirs and archive documents.
Key Words: 27th May, legitimacy, military intervention, National Unity Committee