What made forbes burnham a dictator?

He was a tyrant how use apartheid methods against the majority Indo population. He rigged several elections so that he could oppress the majority Indo's who would never vote for him. In retaliation Burnham gave most of the civil servant jobs to his African power base of voters. He also stopped the importation of basic foods of the Indo community in order to starve the Indo population into submission. As a result of this apartheid, there was a mass Immigration of Indo's to several countries. The first free election was several years after Burnham died. He was also allegedly involved in the assassination of Walter Rodney, a leading Guyanese scholar who opposed him.