Except that we are not talking about a political club. We are not talking about an external group that imposes itself on the workers. Unions are formed by workers, the leaders are elected by the workers and drawn from the workforce, and unions serve the purpose of negotiating employment terms for the workers.
If you would rather have an argument about political clubs go find a forum where it is not wildly off-topic...
You DO see that politics are inevitably tied up in the root cause/purpose of unions though, right? I mean, often it is nakedly political reasons that unions even come to exist in the first place, or this situation with Amazon, for example. Your explanation of what a union is could easily be rewritten for a society made up of constituents electing a candidate drawn from the community to represent them...
What nakedly political reasons do Amazon workers have? They were being told to use a plastic container instead of a bathroom so that they would spend more time working, they were being ordered to put their health and their coworkers' health at risk with inadequate COVID protection, and after more than a year complaining about their working conditions little action was taken (but the workers who complained the loudest were fired for complaining). Amazon management's only response to the effort to unionize in response to all that was to hire consultants to discourage unionization.
Yeah, you are right, the way union representation works is as democratic as political representation. Shareholders also vote on corporate leadership and typically elect other shareholders to the board. That does not make it "political" beyond the internal politics of the organizations involved, and trying to connect those internal politics to the politics involved with government is dishonest.
...and all of that is true, to a much greater extent, of the corporations whose workers unions represent. Do you think Amazon warehouse workers agree with the views of every politician whose campaign received a contribution from Amazon?
I am a big fan of taking money out of politics and banning campaign contributions from unions, corporations, PACs, lobbying firms, and basically any entity that is not an individual citizen. Unfortunately, until that happens, unions must engage with political campaigns to counter corporate political engagement. Corporations push for politicians to pass union-busting laws and to block pro-union laws; unions push for politicians to block such union-busting and to pass pro-union laws.
As for your other comment, I have to wonder whose interests you think unions are representing when they actually sit down to negotiate pay, benefits, work rules, etc. Do you think that when a union rep says, "No, we need a healthcare plan that has a lower deductible," they are doing so because some politician somewhere benefits from it? Do you think "power people" tell a union that, actually, employees should have their wages adjusted according to both their seniority and the local cost of living? The day-to-day business of a union is its workers' interest, just like the day-to-day business of a corporation is its shareholders' interest, regardless of campaign contributions or support for politicians. If the workers feel that their interests are poorly represented, they can vote for different union leaders; likewise, when shareholders feel that their interests are poorly represented they can elect a different board of directors.
What else did those politicians vote on? If your claim is that the union funded politicians because of their support for the invasion of Iraq, that is an extraordinary claim that demands extraordinary proof. Let's see your proof.
[Edit: At the end of the day, union leaders are elected by union members, and if the members do not like how their contract is negotiated they can elect different leaders or otherwise make their voices heard. Call it "bullying" if you want, but I fail to see how non-unionized workers are not being bullied by the companies they work for, given how one-sided negotiations between individual workers and companies are.]
Why does it matter why they funded them? Why are they funding them all all? What is going on the unions are funding one particular political viewpoint?
Read the post you replied to; unions fund politicians who are friendly toward unions because corporations fund politicians who are antagonistic toward unions (or, if we are being charitable, let's say "politicians who are friendly to corporate interests").
...because the corporations on the other side of the table would never support antisemites [0], white nationalists [1], fascists [2], or political parties that harbor and support such deplorable people [3]. Not that the workers have any say in who their employers make contributions to.
Look, I already explained this in my other comments, but you are just ignoring those and repeating anti-union propaganda. Either you are a troll or you are some kind of paid anti-union consultant; if you actually want an answer to your question, read what I wrote again.
You've kind of shifted the debate towards over whether any large institution or organization should be allowed to finance or donate or "fund" political campaigns to the degree that they can at present in the US. I would say they shouldn't be able to. Many other liberal democracies do not allow it.
While I support unions in many cases, I would say that many of the arguments against a decision like the one made in Citizens United in favor of unfettered amounts apply to corporations and unions equally. I found Justice Stevens dissenting opinion extremely convincing compared to the concurring and majority opinion. He raised things like: they do not vote, they "survive" the lifespan of the normal human, they disrupt the spirit of democracy and the conceptual underpinnings of liberal democracy, and they manipulate speech into a concept of power and wealth rather than expression and communication.
So, obviously they're political, but in the sense that they are politically active. And so are corporations. Take away the ability to fund, donate to, or finance, politicians and political campaigns from corporations and unions, and you still end up with a situation where unions collectively protect workers from arbitrary change.
Unions are just another group of people trying to take the little bit of power workers have, to use it for their own ends.