As Milwaukee County Executive in 2009, Walker tried to get rid of the unionized security guards at the county courthouse and replace them with contractors, which he promised would save the county money. The County Board rejected the idea, but in March of 2010 Walker “unilaterally ordered it,” claiming there was a budget emergency....Unfortunately for Walker and Milwaukee taxpayers, an arbiter later ruled that Walker had overstepped his authority, and ordered the county to reinstate the unionized workers, pay backwages, and pay tens of thousands of dollars in arbiter fees.

It turns out Scott Walker has quite the history of screaming "budget emergency" to justify busting public worker unions. ThinkProgress explains:

So even if we set aside the human cost of stripping teachers and maintenance workers and snowplow drivers of their bargaining rights, and even if we set aside the firesale of Wisconsin assets, this is what Wisconsin would have to look forward to a large-scale repeat of if Scott Walker gets his way:

So, the last time Scott Walker did something like this, in his desperation to get rid of employees who joined unions, he improperly fired them, he overestimated how much money that would save, and then he allowed for a private, foreign-based, butt vodka company to put a convicted criminal in charge of security at the Milwaukee courthouse and city hall.