What exactly about unions is progressive? It was something that came out of the industrial revolution, had its breakthrough in the 1930s, its peak in the 1970s, and has been in steady decline for 40 years, and for good reasons.

Promoting postwar politics in 2022 is not progressive, it's regressive.

Anti-union behavior as "interfering" and "attacking" general principles like free speech is your own politically biased framing. Nothing wrong with that, but you could also frame it as supporting the free speech and freedom of assembly of capital owners/managers, or that unions are "interfering" with corporations. The difference between the two warring factions here is not social, it is economic.