Chamblain was second-in-command of a paramilitary organization, the Front for the Advancement and Progress of Haïti (FRAPH), founded in August 1993 as tensions grew between supporters of Aristide's reinstatement and supporters of the military government. With the end of the military regime and restoration of Aristide (following the U.S. Operation Uphold Democracy intervention) in 1994, Chamblain went into exile in the Dominican Republic. He was convicted "in absentia" for his involvement in the murder of Antoine Izméry, a well-known pro-democracy activist, and for his involvement in the Raboteau Massacre.