This is America--and we enjoy many more freedoms than most any other country in the world. Freedom of speech, assembly, and the freedom to support political campaigns during election season are three very important ones.
The national paid firefighters union supported Joe Biden for president. They love him. They endorsed him early, often, and enthusiastically--they even have a dedicated website about their loyal support for Biden. Great--go get em tiger!
Locally, their affiliate supports and endorses candidates as well.
In 2016 they supported a commission candidate that came in a distant, disappointing third place, not even in the running. But even that candidate in that race did much better than the one commission candidate IAFF supported in 2020 who also, very disappointingly, came in an even more distant 3rd place finish-garnering just 22% of the votes in that race. Nearly 8 of 10 voters voted against that