Union activity tended to be in the “hire a bunch of people to knock on doors and ask people to vote for pro-healthcare candidates” category; businesses tend to run commercials and mail glossy mailers to voters asking them to “Thank Representative X for his support for our troops by calling his office” or similar.

Unions are, in the main, also corporations. Don’t believe it? Go to the CT business filing page and search for “*Union” (no quotes).

Of course, having seen how SOME unions work, they’ll get around it the same way that they always have - cowing members by whatever means are available. When you can look up on the internet which of your neighbors donates to what political party or candidate, that starts becoming a dangerously likely ability.