If Wisconsin governor Scott Walker's bill to limit collective bargaining by public employees is passed, the country may see something that hasn't happened since the 1930s: a general strike.

The Wisconsin South Central Federation of Labor, a federation of dozens of labor unions, has endorsed the tactic, in which workers, union and non-union alike, stay off their jobs in a show of solidarity.

We talk with Frank Emspak, history professor emeritus at the University of Wisconsin Extension School for Workers and producer of the radio program W.I.N. "Workers Independent News."