Counsel who represent private colleges and universities are concerned about the impact of a landmark ruling Tuesday from the National Labor Relations Board allowing student teaching assistants at private universities to unionize.

Joseph Ambash, a partner at Fisher & Phillips, who represented Brown University in a 2004 case and authored a brief on behalf of Ivy League schools supporting Columbia’s position, said “the impact of the decision is sweeping because the NLRB basically is saying that our private institutions of higher education, which we all understand to be ‘educational institutions’ have suddenly been transformed into workplaces.”