Who Knows About Workers Unions?

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Are construction unions pretty much the same throughout the US? We are on Long Island NY, there is a building owner/landlord who is using non union workers to renovate a 3 bed room townhouse. Would anyone know if he should be using only union supported contractors? I ask because our community knows this landlord and we know when he is finished with the renovation that he is going to put in another low life renter in there, like all the rest of his buildings, thus damaging the community even further.