Imam Ali (A.S.) Fighting Oppression

Imam al-Baqir (A.S.) has reported: One Day when Amir al-Muminin (A.S.) was returning home, found a woman waiting. Seeing him, she came near and said, “I am in trouble. My husband oppresses me. He has turned me out form the house and has threatened to beat me. If I go to him, he will beat me. I request you to do justice between us.” Amir al-Muminin (A.S.) said, “O Servant of Allah! It is too hot now. Wait until it cools down in the afternoon. Then I shall come with you and redress your grievances.” The woman said, “If I stay out too long, I am afraid it may increase his anger.”
For a moment he bowed his head and then raised it up saying to himself: By Allah, one should not delay getting justice to the oppressed. The right of the oppressed should certainly be taken from the oppressor; and every fear should be taken out from her heart so that she maystand boldly before the oppressor and demand her right.
The Imam (A.S.) further asked where her house was and she told him. He accompanied her to her house, stood at the door and called out loudly, “O master of the house! Peace be upon you.” A young man came out. He was her husband. He did not recognize the Imam (A.S.); he found that an old man of about sixty years had accompanied her and assumed that she had brought him for support and mediation, but he kept silent. At this moment Ali (A.S.) said, "This lady has a complaint against you. She says that you have done injustice to her and turned her out of the house. Besides you have threatened to beat her. I have come here to tell you to fear Allah and be kind to your wife.”
The man said, “In what way does it concern you if I have not treated my wife well? Yes, I had threatened to beat her, but now, since she has brought you to plead for her, I shall throw her into fire and burn her alive.”
Ali (A.S.) was disturbed by the impudence of the man. Drawing out his sword, he said, “I am admonishing you from bad deeds but you are replying me in such manner clearly saying to burn this woman in fire! Do you think there is no authority in this world?” His loud voice drew the attention of the passers by and a huge crowd gathered. Whoever came saluted him respectfully saying, “Peace be on you Amir al-Muminin (A.S.).” When the rude young man realized as to whom he was talking, he trembled and supplicated, “O Amir al-Muminin (A.S.)! Forgive me. I confess my faults and promise that henceforth I shall obey my wife.” Ali (A.S.) turned to the woman and told her to go to the house and cautioned her not to behave in such a manner that her husband had to be angry again. (Al-Manaqib: 106/2)