TangSīr is the name of an ethnic group that lives in the province of Bushehr. Rais Ali Delvari, who is known for fighting against the British colonization of the southern part of Iran, was also TangSīr. In the book "TangSīr," Sadegh Chubak writes about the injustices done by religious leaders to hardworking everyday people, which is still true one hundred years later. It is a must-read book.