Gustavo Petro used to be a guerrilla fighter. The M-19 Guerrilla.
Remember Narco 1 the first season where they stormed the Palace of Justice, that was Petro's doing.
He is hardcore ideological, that's one of the reasons the movement died, because they never went into the pez business. FARC and ELN did and they flourished. M-19 members formed a political party.