The Portuguese Judiciary Police (PJ) have arrested William Byrne, one of the United Kingdom’s most wanted fugitives, suspected of leading a violent drug-trafficking network operating from the Algarve.
Byrne, a 40-year-old Scottish national, was detained on Tuesday near Boliqueime, in the district of Faro. According to the PJ, he headed a “highly violent” criminal organisation involved in the trafficking of cocaine, hashish, and some quantities of heroin across several European countries.
“Yes, it is suspected that he was indeed leading the organisation from Portugal,” confirmed Fernando Jordão, director of the PJ’s Southern Directorate, speaking to reporters. “We believe he had been hiding here, knowing that there was both a domestic arrest warrant and an international warrant against him. That would be the main reason for his presence in Portugal.”
Jordão described the group as “extremely violent,” with a history of homicide, possession of firearms, and evasion of law enforcement. The arrest followed two years of close collaboration between Portuguese police and British authorities, carried out under an international arrest warrant issued by the UK judiciary.
Byrne, who was carrying what is believed to be a false Irish passport, had been living in the Algarve for around two years, allegedly travelling from there to other parts of Europe. “We know of one property he used, but it wasn’t the only one. He was constantly on the move because he was a fugitive,” Jordão added.
On Wednesday, Byrne appeared before a judge at the Court of Appeal in Évora, who ordered his detention pending extradition proceedings to Scotland.
“The investigation in the UK focuses on the drug-trafficking network,” said Jordão, “and we will contribute our findings regarding his activities in Portugal.”
The PJ emphasised that the operation was carried out in the context of international police cooperation with the UK’s National Crime Agency (NCA).
British media had previously reported, in November 2010, that William Byrne — described as “a man who controlled several drug couriers in western Scotland” — had been sentenced to four and a half years in prison.
Byrne, a convicted drug trafficker once described by a judge as “the main player” in a large-scale cocaine operation, has remained a controversial figure more than a decade after his initial imprisonment in 2010.
Originally from Wemyss Bay, Inverclyde, he was jailed for four and a half years in 2010 after admitting to being concerned in the supply of cocaine worth around £250,000. The conviction followed an undercover police operation led by the Scottish Crime and Drug Enforcement Agency (SCDEA), which uncovered a network of couriers smuggling high-purity cocaine across Scotland.
Despite declaring less than £5,000 in income at the time, Byrne was found to be living in a £350,000 detached house and driving luxury vehicles including BMW and Mercedes models. He was later ordered by the High Court in Edinburgh to surrender more than £45,000 under the Proceeds of Crime Act.
Following his release, Byrne resurfaced as a prominent figure in the underground American Bully dog-breeding scene. A 2018 BBC Disclosure investigation linked him to ear-cropping practices condemned by animal welfare groups as “appalling”. The programme revealed Byrne, who ran the UK branch of the American Bully Kennel Club (ABKC), was operating alongside Sean Main, a Glasgow man previously cleared in a £6 million drugs case.
The BBC footage showed puppies with freshly cropped ears at the home of an ABKC judge. Investigators later seized anaesthetics, scalpels and cropping irons during raids on breeders associated with Byrne’s network. Animal welfare experts said the procedures, often performed illegally without anaesthesia, had become a status symbol among organised crime figures.
Byrne was also previously linked to two Inverclyde men jailed in the Dominican Republic for drug trafficking.
