Throwaway account because duh. Note that I am not a current Glitch employee, but am well-connected to Glitch née Fog Creek.
Management was basically incredibly incompetent, for a long time, and were so unfair to employees at the company that they felt this was the only option. There is a Tweet stream a couple months ago from someone who left the company who highlighted the amazing degree to which they were unfairly reviewed and unfairly criticized, alongside how much work product they were expected to produce (which was unreasonable). I have enough corroboration to say that the tweet stream as written is fairly unbiased, and that their experience was common. My understanding is the employees felt backed into a corner.
I think unions can be very, very valuable, but I think needing one at a small company that took a series A round quite recently speaks more to management failure than anything else. I'm happy that they unionized, because it sounds like they needed to, but I am so fucking disappointed that it was necessary.
EDIT: Medium, not Twitter; sorry. https://medium.com/@scientiffic/on-the-aftermath-of-quitting...