Unions have lost their legal bid to overturn the Fair Work Commission's decision to cut penalty rates for hospitality, retail and fast-food workers.

"United Voice believes that the system has once again failed to protect workers and warns that business groups will attempt further attacks on worker entitlement in other industries," Jo-anne Schofield, National Secretary of United Voice, said.

"When our industrial relations laws are used by employers to cut pay and undermine the existing entitlements of workers in our country, when the courts refuse to intervene and when our Government refuses to utter a word in support of these workers, the system is broken."

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