I don't think the government itself particularly hates unions. A lot of government workers are unionized. The problem is that rich people are either getting elected or are buying elections, and the rich-friendly reps are passing more and more laws that weaken unions.

I came across an article recently by some reporters who had "snuck in" to a police union meeting. It's interesting what they saw. One quote:

"When it comes to police unions, what we run across is the left is very suspicious of us because we’re police, and the right is suspicious of us because we’re in unions. We get it from both sides."

https://therealnews.com/beards-and-loathing-a-cop-union-convention-comes-to-las-vegas