A 10-year-long racket of supplying guns to Maoists from one of the oldest ordnance factories in the country was busted in West Bengal today, the police said. Six people, including two guards and two officers of Rifle Factory Ishapore, 50 kilometres from Kolkata, have been arrested for allegedly smuggling out guns to Maoists in India and Nepal and to criminal gangs in Bihar and even terror groups in a racket going on since 2008, the police said.