Photographer Chloé Jafé worked as a hostess in a Tokyo bar to meet and gain the trust of members of the Japanese mafia. Six years later, she published a photography book called I Give You My Life, which according to BBC, "reveal hidden sides to the wives of men in the Japanese underworld – including the tattoos that cover their bodies."

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In 2009, Belgian photographer Anton Kusters went to Japan and gained the trust of high-ranking members Japan's organized crime families, known as the yakuza. He was allowed to photograph them for two years, giving Westerners a revealing glimpse into the secretive underworld syndicate. He published a book in 2011, called Odo Yakuza Tokyo. Earlier this month The Economist produced a short film about Kusters' project, called Japan's Yakuza: Inside the syndicate. Read the rest