The Congressional Workers Union (CWU), which is seeking to build a "safer and more democratic workplace for congressional staff across the U.S. Congress," made an exciting announcement on Monday: they've unionized their first Senate office! Senator Ed Markey of Massachusetts has voluntarily recognized his staff's desire to unionize.
CWU requested Markey voluntarily recognize their unit last year, on March 9 and it appears Markey immediately followed through. Everything since then has apparently been negotiating a formal recognition agreement and a collective bargaining agreement to go with it. Based on what CWU is saying, that process appears complete or almost complete; either way, it's very good for them to have a foothold in the Senate and hopefully staffers in other Senate offices are inspired by their win.