When authorities in the Brazilian state of São Paulo transferred nearly 800 suspected gang members to maximum-security prisons in May 2006, the crime group launched a wave of prison riots and attacks on law enforcement officers. Fifty-nine police and prison officers were killed.
In the following nine days, police officers took their revenge, killing more than 500 people in what were described as shootouts with “criminals”, but which human rights organisations and forensic studies attribute, at least in large part, to executions, including of innocent people.
