To answer this question, we must clearly define the concept of leadership. As I believe it is logical, a leader is the person responsible for organizing and managing everything related to the work team and helping them perform their roles. A great leader inspires political society, human and social change, and even creates revolution.
The best quality to possess as a leader is a great communication skill, telling people the actual story they wish to hear about a current issue creates a sense of belonging in them and in turn builds trust. Great leaders like Martin Luther Jr, had a strong skill in communicating to black Americans on the exact problem happening to the race in America.
He didn't say fluffy things, instead built detailed and backed up insights with examples like his house that was burnt down, which elevated the people to match and protest on different streets of USA.