He served as president of the Potosinista Civic Committee (COMCIPO) — a far-right violent mass organization and an affiliate of the Santa Cruz Civic Committee — when the organization led attacks in Potosí against pro-MAS peasant protestors. Under Pumari’s leadership, the COMCIPO helped spur disruption in the department in tandem with Camacho’s Santa Cruz Civic Committee, to exacerbate the conditions needed for the 2019 coup.
Pumari also ran in the 2020 elections as Luis Fernando Camacho’s vice-presidential candidate. In leaked audio, Pumari allegedly demanded a quarter-million dollars and government positions to run as vice-president.
In December 2021, Marco Pumari was arrested and jailed for crimes related to “obstruction of the electoral process” during the events of the 2019 coup, including unlawful entrance to the presidential palace in the process of deposing Evo Morales.
