The mob boss in the film had hundreds of underlings.
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大哥大 was the popular term in 1980s–90s Hong Kong and mainland China for a large, expensive mobile phone, evoking power and wealth. It literally means 'big big brother', reflecting its association with gang bosses who were often the first to own them.
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In slang, 大哥大 also names a mob boss or triad leader, an extension of its literal 'big big brother' sense.