People who illegally make fraudulent imitations of money, documents, or products to deceive others and gain unfair profit.
From counterfeit + -er (agent noun suffix). Plural of counterfeiter; people engaged in the crime of counterfeiting.
Modern counterfeiters have become so sophisticated with computer technology that the U.S. government redesigns currency every few years with new security features—it's an arms race between criminals and security experts.
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