When an employer prevents workers from entering their workplace, it is called a(n)

Lockout

Explanation:

Lockout is known to be when employers shutdown the place of work in order to stop employees (workers) from gaining entrance into the place of work. Also, many factors can lead to lockout such as financial crisis of the company, maltreatment of workers by employers and so on. Thus, it is temporary and when resolved, workers gain entrance into the company.

Lockout

Explanation:

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