How can I find out how a college treats employees / and if they are unionized?

While expressing concerns about the environment of elite colleges a friend suggested that I find out if the staff were unionized.
This sounds like a good angle to pursue, does anyone know how I might go about it? It could be different in different depts e.g. dining hall, building maintenance, instructional staff, etc. I wonder if there is any ranking of universities on this?

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