Not to put too fine a point on it, but usually the people who know about the union before it's announced are those who are understood to support the idea & are unlikely to go to management about it :)
This is the first I've ever suggested an opinion on it publicly, and I'm a line engineer, not management. Internally, I don't usually talk about things like this, either.
Not sure where you read that from my comment. Corps are filled with non-management workers who will tell management about unionization efforts, either naively or intentionally.
Ah, then it's likely that by chance someone just never got around to talking to you about it. It's a big company! Hopefully you'll soon get to talk to an organizer about your specific doubts.
It might also be that the organizers where only talking to people that they expected to be pro-union (as opposed to selecting people who only had not expressed negative views of unions). This is the safer approach at union-hostile companies like Google.
