On 11 October, 2018, Aluísio Sampaio dos Santos, known as «Alenquer», president of “Sindicato dos Trabalhadores na Agricultura Familiar” was shot dead in his home, located in the Municipality of Altamira, Castelo dos Sonhos district, in Pará state.

One year before his death, the leader uploaded a video on youtube, issuing a statement about threats which he had received from large land owners and land grabbers in that region. As a result, Aluísio reported the threats authorities, but nothing had been done.

According to the news agency called “G1” one of the suspects, Márcio José Nunes de Siqueira was killed during a gunshot exchange with the police, on 13 October, 2018. Furthermore, the prime suspect, Julio César Del Magro, alleged to be the intellectual architect of the crime, was also arrested.