In 2011, the passage of Governor Scott Walker's “Budget Repair” policy retrenched collective bargaining rights for public workers in Wisconsin, a state that was the earliest adopter of these rights and locally celebrated as “union country.” In this article, I use critical juncture analysis to examine this significant case of institutional change. I argue that newly elected GOP politicians initially saw opportunity in a new legislative majority—emerging from the popularity of the Tea Party during the 2010 midterm elections—and attempted strategic policy crafting to mobilize support for this anti-union bill. However, these efforts eventually devolved into a reactive struggle for power with entrenched Democratic legislators and previous policy beneficiaries. Incorporating work on organizational deviance, I show how politicians in both parties sought to control the policymaking process with improvised oppositional tactics that undermined governing norms, ultimately resulting in the bill's passage. This study, thus, expands on theories of institutional change, illuminating the subversive politics of many contemporary movements and political parties.