Police in Japan have launched their biggest ever campaign to try to put an end to organised crime.<br /><br />The investigation includes trying to find out if the Yakuza gang, Japan's most notorious crime syndicate, played a part in a recent massive accounting scandal at camera giant, Olympus.<br /><br />If so, the 92-year-old maker of photographic and medical equipment could be de-listed from the Tokyo Stock Exchange in the coming weeks.<br /><br />In Tokyo's red-light district, where the Yakuza have long held sway, police now patrol the area, ready to shut down businesses run by what Japanese call "anti-social forces".<br /><br />Police have arresting several alleged crime bosses and exposed the role of the gangs in businesses such as construction and baseball.<br /><br />Al Jazeera's Steve Chao reports from Tokyo.
