In Brazil, Maximum-Security Prison on an Island 700 Meters from the Mainland Became the Scene of a Massacre in 1952 with 9 Guards Killed and 129 Prisoners Escaping Through the Beaches Until It Was Closed in 1955 in Ubatuba

Written by Romário Pereira de Carvalho

Published on 25/02/2026 at 13:40

Ruínas do presídio da Ilha Anchieta atualmente — Foto: Reprodução/ Parque Estadual da Ilha Anchieta

Uma pessoa reagiu a isso.

Rebellion on Anchieta Island on June 20, 1952 Left 9 Guards Dead, 129 Escaped Prisoners and Marked the First Massacre in Prison in Brazil 700 Meters from the Mainland

On June 20, 1952, the massacre at the correctional facility that occurred at the Anchieta Island Correctional Institute in Ubatuba resulted in the deaths of 9 guards, the escape of 129 inmates, and a direct impact on the São Paulo prison system, marking a significant moment in Brazilian penal history.

Located 700 meters from the mainland on steep terrain, the Anchieta Island Correctional Institute functioned as a maximum-security prison on the northern coast of São Paulo.

The site entered history for the first major massacre in a prison recorded in the country.

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On the morning of June 20, 1952, taking advantage of a reduced workforce, prisoners took control of the unit.

The San João festivities left only 17 civilian staff and 28 military personnel on duty, an insufficient number to contain 453 inmates.

Rebellion Resulted in Deaths, Escapes and Destruction of the Penitentiary

During the action, prisoners freed their companions, looted safes, destroyed buildings, and burned records.

Nine guards were executed. The episode solidified as a defining moment of massacre in prisons in Brazilian history.

A total of 129 inmates reached the beaches of Ubatuba. Another 108 were recaptured, 15 died, and six went missing. The rebellion highlighted structural flaws and generated immediate repercussions in the São Paulo prison system.

Impact on the São Paulo Prison System After the Massacre in Prison

The incident accelerated projects that were already on the agenda. The episode contributed to changes in the state penitentiary system, given the repercussions of the massacre in prison and its institutional consequences.

Three years later, on September 3, 1955, the Anchieta Island Correctional Institute was deactivated. A week later, the historical event was depicted in the film Mãos Sangrentas, directed by Carlos Hugo Christensen, shown at the Venice Film Festival.

Carandiru Surpassed Anchieta Island Numbers as the Largest Massacre in Prison

Although significant, the Anchieta Island episode was not the deadliest prison massacre in the country. The bloodiest case occurred on October 2, 1992, in Pavilion 9 of Carandiru in São Paulo.

At that time, 111 prisoners were killed just before the municipal elections. The scenario included overcrowding, human rights violations, and a lack of structural policies.

In 2001, Colonel Ubiratan Guimarães was sentenced to 632 years but was acquitted in 2006 by the TJ-SP on the grounds of strict fulfillment of legal duty.

With information from Diário da Região.

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In Brazil, Maximum-Security Prison on an Island 700 Meters from the Mainland Became the Scene of a Massacre in 1952 with 9 Guards Killed and 129 Prisoners Escaping Through the Beaches Until It Was Closed in 1955 in Ubatuba

Rebellion on Anchieta Island on June 20, 1952 Left 9 Guards Dead, 129 Escaped Prisoners and Marked the First Massacre in Prison in Brazil 700 Meters from the Mainland

Major Oil, Gas, and Energy Event Will Take Place in Brazil: Macaé Energy Will Gather Petrobras, Equinor, Prio, Among Other Suppliers and Energy Executives for Business, Networking, and Employment Opportunities

Rebellion Resulted in Deaths, Escapes and Destruction of the Penitentiary

Impact on the São Paulo Prison System After the Massacre in Prison

Carandiru Surpassed Anchieta Island Numbers as the Largest Massacre in Prison

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In Brazil, Maximum-Security Prison on an Island 700 Meters from the Mainland Became the Scene of a Massacre in 1952 with 9 Guards Killed and 129 Prisoners Escaping Through the Beaches Until It Was Closed in 1955 in Ubatuba

Rebellion on Anchieta Island on June 20, 1952 Left 9 Guards Dead, 129 Escaped Prisoners and Marked the First Massacre in Prison in Brazil 700 Meters from the Mainland

Major Oil, Gas, and Energy Event Will Take Place in Brazil: Macaé Energy Will Gather Petrobras, Equinor, Prio, Among Other Suppliers and Energy Executives for Business, Networking, and Employment Opportunities

Rebellion Resulted in Deaths, Escapes and Destruction of the Penitentiary

Impact on the São Paulo Prison System After the Massacre in Prison

Carandiru Surpassed Anchieta Island Numbers as the Largest Massacre in Prison

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Buried under China, a colossal machine weighing 20,000 tons began operating as the largest neutrino detector on the planet and, in just 59 days, surpassed results that science took half a century to achieve.

With 11,000 tons and sensors capable of hunting submarines at long distances, the Type 055 has become one of the most feared floating arsenals of the Chinese navy.

A bright yellow mushroom imported from Asia escaped from a cultivation farm in the United States in 2010 and is now aggressively spreading across 25 states, destroying entire communities of native fungi in American forests.

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