In 1981, Charles's government was threatened with two attempted coups. The first was led by Frederick Newton, commander of the Military of Dominica, who organised an attack on the police headquarters in Roseau which resulted in the death of a police officer. Newton and five other soldiers were found guilty in the attack and sentenced to death in 1983; the sentences of the five accomplices were later commuted to life in prison, but Newton was executed in 1986. A second occurred later in the year when the country was threatened with a takeover by mercenaries in Operation Red Dog, led by Mike Perdue and Wolfgang Droege. They tried to overthrow Charles as Prime Minister and reinstall ex-Prime Minister John in exchange for control over the country's development. The FBI was tipped off, and the ship hired to transport the mercenaries never left dock. The mercenaries lacked formal military experience or training, and most of the crew had been misled into joining by the ringleader Mike Perdue. White supremacist Don Black was also jailed for his part in the attempted coup, which violated US neutrality laws.