Stanford, Calif.

UNLESS something changes in Washington, American workers will, on New Year’s Day, effectively lose their right to be represented by a union. Two of the five seats on the National Labor Relations Board, which protects collective bargaining, are vacant, and on Dec. 31, the term of Craig Becker, a labor lawyer whom President Obama named to the board last year through a recess appointment, will expire. Without a quorum, the Supreme Court ruled last year, the board cannot decide cases.

What would this mean?

Workers illegally fired for union organizing won’t be reinstated with back pay. Employers will be able to get away with interfering with union elections. Perhaps most important, employers won’t have to recognize unions despite a majority vote by workers. Without the board to enforce labor law, most companies will not voluntarily deal with unions.

If this nightmare comes to pass, it will represent the culmination of three decades of Republican resistance to the board — an unwillingness to recognize the fundamental right of workers to band together, if they wish, to seek better pay and working conditions. But Mr. Obama is also partly to blame; in trying to install partisan stalwarts on the board, as his predecessors did, he is all but guaranteeing that the impasse will continue. On Wednesday, he announced his intention to nominate two pro-union lawyers to the board, though there is no realistic chance that either can gain Senate confirmation anytime soon.

For decades after its creation in 1935, the board was a relatively fair arbiter between labor and capital. It has protected workers’ right to organize by, among other things, overseeing elections that decide on union representation. Employers may not engage in unfair labor practices, like intimidating organizers and discriminating against union members. Unions are prohibited, too, from doing things like improperly pressuring workers to join.