The Dropkick Murphys are demanding that the governor of Wisconsin, Scott Walker, get a new soundtrack.

The Celtic punk-rockers were displeased to hear their rowdy cover of Woody Guthrie's "I'm Shipping Up to Boston" used by the Republican politician at the Iowa Freedom Summit this weekend. Walker was on hand to discuss conservative reforms he's enacted in his state, which include limiting collective bargaining powers of public workers and eliminating state funding for Planned Parenthood.

Dropkick Murphys 'Cut Loose' on New Album

Walker's anti-union stance has long sat poorly with the outspoken, pro-union Dropkick Murphys. After hearing their rallying song introduce his speech on Saturday, the members took to Twitter:

@ScottWalker @GovWalker please stop using our music in any way...we literally hate you !!! Love, Dropkick Murphys -- Dropkick Murphys (@DropkickMurphys) January 25, 2015

The Murphys' seafaring song has been used by others in Walkers' camp; in 2012, his ally and Republican Senate hopeful Jeff Fitzgerald used "I'm Shipping Up to Boston" at the Wisconsin GOP convention. The band took to Facebook to blast Fitzgerald as a "crony of anti-union governor Scott Walker," adding, "Using a Dropkick Murphys song as an intro is like a white supremacist coming out to gangsta rap...If you and your staff can't even figure out your music, you might wanna give up on the politics!"

Walker has not yet replied to the Murphys' tweet, but did post euphorically after his speech, "America needs to go big and bold!" Perhaps he should write a song about it.