Jean-Juste returned to Haiti in 1991, becoming a "prominent supporter" of Jean-Bertrand Aristide, Haiti's first democratically elected president, and his Fanmi Lavalas party. Following a military coup by Raoul Cédras that unseated Aristide less than a year after his election, Jean-Juste then spent the next three years in hiding. When Aristide resumed office in 1994, Jean-Juste resumed his work as well, becoming rector of Saint Claire's church in Port-au-Prince. One of his legacies is a food program for hungry children in the St. Claire's neighborhood, which continues to be supported by the What If? Foundation, a nonprofit organization in Berkeley, CA.