Gee, I wonder why Houston is sticking it to the SEIU protestors so hard?

So the protestors who successfully brought Houston Janitorial companies to the bargaining table (and won big) are facing up to $2,000 in fines for tying up traffic. The city is taking a very hard line against people who essentially broke traffic and public congregation laws to bring attention to people making starvation wages. So are they being punished for that, or because they won?