In Pakistan, there has been a history of sectarian violence and unrest since the 1970s, although much of the violence may be attributed to non-theological clashes over tribal lands, rivalries, and class-disputes.[citation needed] Almost all relations between Shias and Sunnis are peaceful, and there exists a large degree of intermarriage between the two communities. Further, many prominent Shias play an important political role in the country — the late Benazir Bhutto is believed to have been Shia, for example. However, sporadic violence between the two communities is often initiated by extremists on both sides, particularly in South Punjab.[citation needed]