The BSO musicians, who are organized under Local 40-543 of the American Federation of Musicians, are not the first orchestral musicians to file charges with the NLRB during negotiations. Michael Hayes, an associate professor of law at the University of Baltimore, pointed to examples of similar charges that AFM locals levied against orchestras over the past few years. For instance, the NLRB ruled last year that the Colorado Symphony could no longer avoid providing relevant contract information to its musicians during collective bargaining. Conversely, it dismissed Chicago Symphony Orchestra musicians’ charge that its management acted in bad faith in the same year.