I don't know much about unions either, but found this recent NPR interview to be informative. Like many interviews, the guest is selling a book.

https://www.wbur.org/onpoint/2019/08/14/labor-unions-beaten-...

Steven Greenhouse, author of "Beaten Down, Worked Up: The Past, Present, and Future of American Labor." Reporter at The New York Times for 31 years, who covered labor and the workplace for 19 years. (@greenhousenyt)