Lockouts are viewed by the NLRB as an unfair labor practice in all cases.

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The NLRB does not generally view a lockout as an unfair labor practice. For example, if your product is perishable (such as vegetables), then a lockout may legitimately serve to neutralize union power. The NLRB views a lockout as an unfair labor practice only when the employer acts for a prohibited purpose. It is not a prohibited purpose to try to bring about a settlement of negotiations on terms favorable to the employer.

Lockouts Are Viewed by the NLRB as an Unfair Labor