Kata'ib Sayyid al-Shuhada is a group of people who believe in a certain way of life and religion. They live in a place called Iraq and work together to protect their people and beliefs. They call themselves "Sayyid al-Shuhada" which means "masters of martyrs" because they respect and honor those who have died while serving their group. They also have their own military group that is trained to fight if they need to protect themselves or others. They believe in doing good things for their community and helping each other out.