It seems like governments are somewhat uniform in the laws they pass, but fundamentally fickle about which laws they choose to enforce. In my state, for example, it's a felony to be a member of a subversive organization...
http://app.leg.wa.gov/RCW/default.aspx?cite=9.81.030
...e.g., the Communist Party...
http://app.leg.wa.gov/RCW/default.aspx?cite=9.81.083
...but it would be unthinkable for them to actually prosecute anyone for it.