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Mr. Meisburg said NLRB officials cut corners in an effort to implement pro-labor rules before Mr. Becker lost his post at the end of 2011.

“It’s more a reflection of the fact that the board rushed to get these done,” he said. “They were very concerned that [Becker’s appointment] was going to expire at the end of the year. In rushing to get them done, they left themselves open to some legal challenge.”