Jiùshí Shànghǎi gōngrén yǒushí bèi qīngmiè de chēngwéi zhūluó.
In old Shanghai, laborers were sometimes contemptuously called zhūluó.
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猪猡 is a Shanghai dialect (沪语) term, historically used as a derogatory label for laborers or lower-class people, equating them to pigs. It is considered offensive and vulgar. Appears in Republican-era Chinese literature set in Shanghai.
culture
猡 (luó) historically referred to certain ethnic minority groups in Southwest China (now considered pejorative); combined with 猪 (pig) the compound becomes a crude insult. The term gained literary infamy through 1930s proletarian fiction.