Eschat0n posted:

With the requested addition of the sources they use. I don't think the sources they're citing look bad to me:

https://www.bls.gov/cps/cps_over.htm

https://www.bloomberg.com/news/articles/2017-02-16/unions-are-losing-their-decades-long-right-to-work-fight

https://www.michigancapitolconfidential.com/michigans-largest-teachers-union-has-lost-25-percent-of-its-members

https://www.heritage.org/jobs-and-labor/report/unions-charge-higher-dues-and-pay-their-officers-larger-salaries-non-right

https://nces.ed.gov/surveys/sass/

"In trying to determine whether the CPS or SASS provided better numbers, we developed another means of examining union membership – by looking at state payroll figures. Data were accumulated from all of the states on the number of state employees (excluding universities, for administrative convenience), those in mandatory collective bargaining units, and those that have union fees deducted from their paychecks. Employees who had dues withdrawn constituted a membership rate floor (as opposed to a membership rate, because there is a possibility that some members paid by means other than a paycheck withdrawal)."

https://assets.documentcloud.org/documents/4116996/NEA-8Essentials.pdf