Pinochet, State Immunity and the Limits of International Accountability

Background

On 11 September 1973, General Augusto Pinochet led a coup that removed President Allende and established a military regime in Chile. His rule lasted until 11 March 1990 and is widely associated with torture, murder and enforced disappearances. As the document states, these acts were allegedly carried out "under his directive and, with his knowledge, as part of a broader conspiracy he was involved in."

In 1998, while in the United Kingdom for medical treatment, Pinochet became the subject of an international arrest warrant issued by Spain. British authorities arrested him in London on 17 October 1998. The Divisional Court initially quashed the warrants on immunity grounds. The matter then escalated to the House of Lords, where the legal battle centred on extradition crimes and the scope of immunity for former heads of state.

Spain's formal extradition request expanded the allegations to include conspiracy to seize power and commit atrocities both within and beyond Chile. The Lords were required to determine which charges satisfied the double criminality rule and whether Pinochet could rely on immunity for acts of torture.

The Legal Framework

Extradition and Double Criminality

Under the Extradition Act 1989, an offence is extraditable only if it constitutes a crime in both the requesting and requested state. This double criminality rule became central to the case.

International law evolved after the Nuremberg trials to recognise certain offences as international crimes. Torture became one such offence after the International Convention Against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment 1984, which the UK incorporated into law by section 134 of the Criminal Justice Act 1988 (CJA 1988). However, the CJA 1988 did not apply retrospectively. As the document notes, it "did not apply retrospectively to acts of torture committed outside the UK before 29 September 1988."

This meant most alleged conduct occurred before torture became a UK offence, raising doubts about whether it met the double criminality rule.

State Immunity

The Lords also had to consider whether Pinochet retained immunity under section 20 of the State Immunity Act 1978, which incorporates the Vienna Convention on Diplomatic Relations through the Diplomatic Privileges Act 1964. The Convention grants immunity ratione personae to serving heads of state and immunity ratione materiae for official acts performed while in office.

The question was whether torture could ever be considered an official act.

Pinochet (No 1)

In the first judgment, a 3-2 majority (Lord Nicholls, Lord Hoffmann, Lord Steyn) held that Pinochet was not entitled to immunity. The Lords emphasised that international law recognises genocide, torture, hostage taking and crimes against humanity as offences that cannot fall within legitimate state functions. As the judgment stated, "such grave offences cannot be considered within the scope of legitimate functions of a Head of State."

Lords Slynn and Lloyd dissented.

Pinochet (No 2)

The decision in Pinochet (No 1) was set aside when it emerged that Lord Hoffmann had undisclosed links to Amnesty International, which had intervened in the case. The court convened a new panel, leading to Pinochet (No 2).

Pinochet (No 3)

The Majority

The final judgment required the Lords to reconcile the Convention Against Torture with domestic legislation. Lord Browne-Wilkinson explained that denying immunity to a former head of state for torture would mark the first time a domestic court rejected immunity for such grave international crimes.

The majority held that torture could not be an official function. They reasoned that accepting torture as an official act would produce "bizarre consequences." The document explains this clearly: torture is defined in the Convention as an act carried out "by someone acting in an official capacity," yet state immunity would make prosecution impossible unless the torturing state waived immunity.

Thus, the majority concluded that Pinochet did not enjoy immunity for acts of torture committed after 29 September 1988.

Lord Goff's Dissent

Lord Goff disagreed. He argued that an act's criminal nature does not remove its official character. He found no evidence in the Convention or its preparatory works suggesting an intention to remove state immunity. He warned that abandoning immunity could expose officials to politically motivated prosecutions abroad, noting the risk of "opportunistic legal actions by other states."

Despite this, the House ruled that Pinochet could be extradited for torture committed after the CJA 1988 came into force.

Commentary

The Pinochet litigation transformed international criminal law. It established that former heads of state cannot rely on immunity for torture, reinforcing the principle that certain crimes transcend sovereignty. It also showed the practical limits of universal jurisdiction, as only conduct after 1988 satisfied double criminality.

The judgment is celebrated for advancing accountability but criticised for its diplomatic implications. As the document notes, it "opens the door to jurisdictional overreach and could complicate international cooperation." The case remains a defining moment in balancing justice for grave international crimes with the principles of state immunity.