Communism

He (and his government) were accused of arresting political opponents, putting political opponents through show trials, requiring people to prove their innocence when on trial, not allowing defendants to be represented by counsel, and of issuing summary punishments to some groups of protestors.

In a brief search, I could confirm arresting political opponents (not speaking to whether there was cause), and denying defendants a lawyer (not illegal in Burkina Faso, just "against international standards").