New Delhi, Aug. 29 -- Tanzania's governing party expelled the vice president who resigned this week, in an act of retaliation that will further test the credentials of the East African nation as a place of relative peace and stability.

A meeting of the Chama cha Mapinduzi, or CCM, party decided to punish Emmanuel Nchimbi for indiscipline, and it nominated Energy Minister Deogratius Ndejembi to become President Samia Suluhu Hassan's deputy, CCM Secretary-General Asha-Rose Migiro told reporters late Wednesday.

The maneuver is believed to be part of the ongoing fallout from Hassan's contentious election in October, when the security forces were deployed to put down riots over the disqualification of the president's main rivals. The interne...