blue-collar worker; blue-collar employee
Refers to a worker engaged in manual or industrial labor, as opposed to white-collar office work. The term is a direct calque from English 'blue-collar'.
He works as a blue-collar worker in a factory.
Refers to white-collar workers, typically office or administrative staff, contrasting with 藍衣社員.
From 藍衣 (らんい, 'blue clothes') + 社員 (しゃいん, 'company employee'), a calque of English 'blue-collar worker'.