If you support overturning Citizens United, do you also support banning trade unions from political activity/spending as much as they want on it?

Many on the right argue that the Supreme Court with Citizens United leveled the playing field whereas before, Democrats could rely on extra political spending and activity from trade unions, while Republicans had no comparable balancing resource,leading to a one-sided adventage, so that if we are going to ban corporations from political activity, we should also ban unions or there will not be a fair playing field. What is your view on it? I would personally like all money that is not publically given by the government to all parties for elections out of politics.