After Imam Hussein (A) was martyred in Karbala the duty of Zeinab (S) started. The most important duty of her was to spread the message of Karbala and to uncover its tragedy. Besides, she was responsible to watch over the kids and women of Bani Hashim’s martyrs, she fulfilled her duty in an excellent way. She traduced Banu Umayyah and Yazid by delivering lectures in Kufa and Damascus. She said to Yazid: "O Yazid! You did what you wished, but remember that you have cut your own skin and your own flesh to pieces. Soon you will be brought before the Holy Prophet (P). You will be overburdened with the weight of your sins committed by shedding the blood of his progeny and by dishonoring his family. The place to which you will be taken will be before all the members of his family. The oppressed will be avenged and the enemies will be punished."[1]
[1] The Victory of Truth, p 17. https://www.al-islam.org/victory-truth-life-zaynab-bint-ali