No, corporations are the unions' worst enemy. You say you think strong unions are a check and have a place, but a 55% fall in membership in one year isn't restraint; it's disembowelment. Actually, I was pretty complacent about Walkerism until seeing this article Torie posted. I haven't always been the friendliest to unionism myself in the past. But this is shocking.
And all this is considering, as I said, unionism is already dead in the private sector. It's already dead in the south. Pretty much the only place it's still alive is in states like Wisconsin and in the public sector. And now, Walker will most likely win the recall leaving the unions totally eviscerated. The Democrats in the future will turn to the Koch Brothers to fund their campaigns.
Unions are still strong (for now) in the North East no? Still kind of strong in the rust belt (what's left of it). The teachers unions are still strongish nationally. If the people still felt the unions were serving them this sh**t wouldn't pass, but the unions have burned any and all the good will they had by constantly doing things the people find heinous. The jokes about lazy union members didn't come out of a board room of a Fortune 500 company, they came from people observing lazy unions members. The jokes about corruption and ties to organized crime didn't come from a guy in a suit, they came because unions have historically been corrupt and had ties to organized crime.