KHARTOUM (Reuters) - A Sudanese court handed a death sentence on Saturday to a leader of Darfur's most powerful rebel group, the Justice and Equality Movement, saying he violated the constitution and fomented war against the state, Sudan's state news agency said. Al-Tom Hamed Tutu was captured in Southern Kordofan state, where fighting broke out in June between the Sudanese army and groups seeking to wrest control of the region from Khartoum. JEM, which is mostly active in neighbouring Darfur, joined up with a branch of the Sudan People's Liberation Army to attack govt troopsin July.