No. 10-3639. Argued April 15, 2011. Decided May 16, 2011. Linda Dreeben, Attorney, Robert J. Englehart, Supervisory Attorney, Christopher W. Young, Attorney, National Labor Relations Board, Office of the General Counsel, Washington, DC, for Petitioner. Scott V. Kamins, Attorney, Offit Kurman, Maple Lawn, MD, for Respondent. Before POSNER and MANION, Circuit Judges, and LEFKOW, District Judge. The Honorable Joan Humphrey Lefkow of the Northern District of Illinois, sitting by designation. LEFKOW,