THE number of fugitives extradited from Hong Kong doubled last year as United States authorities tackled sophisticated, Asian-based, organised crime gangs head-on. The largest number of suspects arrested in the territory was linked to international drug trafficking syndicates who were allegedly smuggling heroin from Asia to New York. A total of 28 people were extradited last year, with 25 sent to the US. Two other alleged drug traffickers were sent to Canada while a suspected murderer was returned to Macau. Four people wanted in Hong Kong for murder and corruption charges were extradited from the US, Sweden and New Zealand to the territory. Last year's total figure was more than double the 13 fugitives extradited in 1992, all to the US. Senior Assistant Crown Prosecutor with the Legal Department, Andrew Bruce, who is in charge of extradition cases, called 1993 ''a banner year for international co-operation in fighting crime''. A further five people wanted by the US for counterfeiting, drug offences and murder have been arrested in Hong Kong and are awaiting extradition. Two of these are alleged Fuk Ching members, suspected gang boss Kwok Ling-kay and his bodyguard Li Xing-hua, who are wanted in the US for murder and kidnapping. Both are also thought to be linked to the ill-fated Golden Venture, which beached off Rockaway Beach in Queens near New York in June. with more than 300 illegal Chinese immigrants on board.