Maybe you mean for white collar workers? The separation between blue collar management and employees is very old: it’s in verses of “We wish you a Merry Christmas”, and is even discussed in the Bible.
It wasn't so in the past, but for the past 100 years or so, co-operation between unions and employers has been mostly constructive.
This is not a Utopia as some other commenters are saying. It's perfectly achievable if both sides acknowledge they need the other and are willing to discuss issues in good faith.