I really (and sincerely) cannot understand why any socialist would want to remain in the EU. Okay, if we leave, it is going to be hell until we vote in a socialist government but it will only require that one step to get us into a position where radical change (the heavy taxation of big business and the superrich for the good of all) can happen. The EU is presently in thrall to the neoliberal powers that control the world's economy and to change the economic zeitgeist the citizens of the EU will have to vote in socialist governments in more than half the member states using electoral systems that favour no clear winner. This will require a heck of a lot more steps than we will need to take if we go it alone.
We will definitely be worse off financially if we leave the EU, every one of us, but we would also be in a much better position to do something about the obscenely unfair distribution of wealth in our nation which, hopefully, will cause of domino effect throughout Europe and the rest of the world.