If ever there was a clearer example of why no politician should be allowed to serve more than eight years in office, it is Robert Mugabe, it was clear from his early days that this was a man upon whom power was never going to sit lightly. Never the less most of us on the left welcomed his victory in the election that followed the signing of the Lancaster House Agreement.[LHA] Sadly we were to be bitterly disappointed and watched helplessly as he gradually moved against all progressive opposition forces which had emerged from the national liberation struggle. Although in truth the signs were there from day one when the only other viable pole of political influence within ZANU, General Josiah Tongogara was killed in a mysterious car crash just four days after the LHA had been signed.
At first Mugabe moved against his opponents, real or imagined by either co-opting them into government or out maneuvering them into the political wilderness. However between 1983 and 1985 he ordered the Zimbabwean armies 5th Brigade into Matabeleland and the Midlands regions of Zimbabwe, resulting in the death of over 5000 people belonging to the Ndebele who had supported Joshua Nkomo’s ZAPU during the liberation struggle. From that day on the die was cast.
Stephen O’Brien has an interesting article on the opposition forces within Zanu here http://links.org.au/node/481
whilst it is not perfect as it has some glaring gaps in the narrative it is worth a read.