These are regarded as the Muslims most responsible for what happened. They wrote to al-Husayn asking him to come and promising to support him. They reneged on their promises. Yet they did not limit this to breach of faith and desertion.
Some of them, including most of their leaders, actually stood alongside the Umayyad oppressors despite the letters which they were involved in writing to ask al-Husayn to come to them. Verses by Tala'i' ibn Zurayk show this. He describes how when the tribes of Iraq summoned al-Husayn, he answered them. Yet when he summoned them, they did not listen. Hypocrisy was spread among them at Karbala' when they had claimed to belong to the Shi'a. May God punish them for what they did.
Some of them, including most of their leaders, actually stood alongside the Umayyad oppressors despite the letters which they were involved in writing to ask al-Husayn to come to them. Verses by Tala'i' ibn Zurayk show this. He describes how when the tribes of Iraq summoned al-Husayn, he answered them. Yet when he summoned them, they did not listen. Hypocrisy was spread among them at Karbala' when they had claimed to belong to the Shi'a. May God punish them for what they did.