Amazon.com Inc. was legally the boss of a group of subcontracted delivery drivers, US labor board prosecutors have concluded, rejecting the company’s claims that workers in its sprawling delivery network aren’t its employees.

The general counsel office of the US National Labor Relations Board has determined that a group of drivers in Southern California were employees of Amazon itself, as well as of the “delivery service partner” company that hired them, agency spokesperson Kayla Blado said Thursday.

The agency prosecutors also conc

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