Second, the bracero program, a temporary annual guest worker permit for low skilled Mexican farm workers, was discontinued on the eve of the Immigration Act of 1965 due to labor union pressure.

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Employers who try to discipline staff for comments on Facebook can run into Federal laws, especially if the employees are union members and come under the National Labor Relations Act.

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This would be the biggest pro-union shift in the balance of labor-management power since the Wagner Act of 1935.

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