Bonde dos 40

Bonde dos 40 emerged in 2007 due to contact between inmates from Maranhão and prisoners from other states who belonged to different criminal organizations in federal penitentiaries.^[3] Within just two years, they began operating both inside and outside prisons in the interior of Maranhão, even forming alliances with Comando Vermelho (CV) and Amigos dos Amigos (ADA).

Between 2010 and 2014, the group became known for instigating riots in prisons and in the Pedrinhas Penitentiary Complex against the Primeiro Comando do Maranhão (PCM), and for carrying out attacks on the streets, resulting in the deaths of over 100 inmates.^[4] Since then, PCM and B40 have been violently battling for control over stilt neighborhoods and peripheral communities, causing dozens of deaths and injuries.^[5]

In 2019, it was reported that this organization expanded its operations to Teresina, the capital of the state of Piauí.^[6] It was also reported that same year that it entered into a war with Comando Vermelho to dominate the Vila Conceição neighborhood in southern São Luís.^[7]