Big Labor pledges it will go all in, again, in its drive to knock out its top political adversaries in 2014.

And one of the biggest targets is Wisconsin Republican Gov. Scott Walker, hero to conservatives, bane of the left for his public-sector collective bargaining reforms.

Michael Podhorzer, political director of the AFL-CIO, in a New York Times piece last week said the nation’s labor unions look to spend at least $300 million going after Republicans in this fall’s elections.