Jǐngfāng dàibǔ le yī gè zhuānmén qiāozhàlèsuǒ shāngjiā de tuánhuǒ.
Police arrested a gang that specialized in extorting businesses.
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usage
敲诈勒索 is a four-character legal term combining two synonymous verbs: 敲诈 (to swindle/extort) and 勒索 (to extort/demand by force). Used in criminal law contexts. As a noun phrase it means 'extortion'.