One could be forgiven for thinking it was an elaborate April Fool’s joke. On April 1, thousands of people marched through Colombian cities in a protest against corruption — led by some of the country’s most corrupt politicians.

Foremost among them was former president Álvaro Uribe, now a senator and leader of the inaccurately named Democratic Center (the political party is far to the right). Implicated in the murders of thousands of innocent people by the army, collusion with paramilitaries, illegal wiretapping, and countless cases of bribery and corruption, Uribe seems an odd choice for leader of an anticorruption march.

But in reality, this was no such thing. It was the Right’s attempt to show their continued opposition to the country’s peace process and prepare for next year’s presidential election, which looks set to the most contentious in decades.