Simple, fines and arrest. When you make things inconvenient and uncomfortable for a hog, they fall in line. Think about what makes people wear a seatbelt. Hogs don't think deeply, they just do what they feel. But if their choice becomes painful, they comply. Things like this that don't have any clear ideology and aren't exactly a huge inconvenience are easy to enforce. But if you have a clear identity and or project that has real material consequences and the state suppresses it, there will be a lot of resistance.