Constitutional lawyer and leader of eminent group of Nigerians, The Patriots, Professor Ben Nwabueze (SAN), has admonished pro-Biafra groups under the umbrellas of the Indigenous People of Biafra (IPOB) and the Movement for the Actualization of Sovereign State of Biafra (MASSOB), to have a rethink over their renewed calls for the State of Biafra.