The formation of labor unions is governed by the National Labor Relations Act (NLRA) of 1935. This Act secures workers' abilities to bargain as a group instead of individually. The NLRA prohibits employers from firing and disciplining workers for trying to organize labor. For the most part, employers cannot ban or discriminate against pro-union employees. If the employees want to be represented by a Union, they are free to make that choice.
https://www.legalmatch.com/law-library/article/employers-rights-and-unions.html
Was union protection one of the points of discussion in the January meetings with the whistle blowers?
The United Food & Commercial Workers Local 400 confirmed that Sanders campaign workers were the first to win union representation.
We expect this will mean pay parity and transparency on the campaign, with no gender bias or harassment, and equal treatment for every worker, whether theyre in Washington, D.C., Iowa, New Hampshire or anywhere else, UFCW Local 400 President Mark P. Federici said in a news release.
Working on political campaigns at any level often involves grueling hours and low pay. And recently, workers on some campaigns have been pushing to unionize.
Earlier this year, Sanders apologized to female staffers on his 2016 presidential campaign who said they had experienced sexual harassment from male staffers. The New York Times had reported allegations of unwanted sexual advances, as well as pay inequity.
https://www.apnews.com/be93d7afe8e942728fd828832d202e7c