According to natural law theory, some of the most basic natural (human) rights, as defined by Locke, are the rights to :life, liberty, and property." Locke wrote, "Reason, which is that Law teaches all Mankind, who would but consult it, that being all equal and independent, no one ought to harm another in his Life, Health, Liberty, or Possessions." Thomas Jefferson famously reformated that concept in the Declaration of Independence to "life, liberty, and the pursuit of happiness."
Your right to life is a guarantee that you "own" yourself - that you control you own person. The right to liberty ensures that you can follow your own will, in the absence of law, and that you will not be subject to the arbitrary will of another. The right of property means that you benefit from the sweat of your brow, and of your ideas or ingenuity.
The problem with modern "socialism" is that a great number of people feel entitled to live off of the effort and possessions of others. Concepts, such as the "redistribution of wealth," are antithetical the the basic premises of natural law theory. Governments are instituted to provide justice and to defend the society that created them. Anything beyond that smacks of tyranny.