Unions in favor of big corporate intrusion on small communities

A large corporation with an unflattering track record was trying to establish a large music venue right downtown in my small city. The building of this venue was protested by many locals, especially those who are part of the local music scene and those who help run small local venues + was also protested by concerned citizens about the nightmare it could create. This feels classic: locals part of a tight small community protesting a giant unethical corporation trying to plant itself in the midst of the community.

I went to the city council meeting where the decision was being made and where many, both for and against the venue, were giving their input. Interesting to me was that many who were FOR the building of the venue were part of labor unions who would be benefitted by the construction because they would be working on it.

This was interesting to me because I am new to trying to understand unions and have been listening and reading generally socialist and leftist literature which has been generally pro-union. And yet it seems that, in general, leftists would also be anti-giant corporations intruding on local communities and culture. It just became apparent to me that the question of unions seems more nuanced and complicated than it appears at first glance. It seems that these particular labor unions in this case be pro-capitalist enterprise at the expense of local communities in this case.

I'm just wondering what the socialists here would have to say about this. What are your thoughts on unions when they end up supporting corporate intrusion when it benefits the particular workers of those unions? Thanks.