Hěn duō tōudùzhě dōu shì tōngguò shétóu chūguó de.
Many illegal immigrants went abroad through snakeheads.
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蛇头 specifically refers to the organizer of illegal human smuggling operations. The term became widely known in the 1990s with waves of Chinese immigration to the West. The migrants themselves are sometimes called 蛇仔 (shézǎi).