Millennial editor Robert Christian has a new article at Crux. He writes:

Subsidiarity helps us to translate our sense of solidarity into social justice. While it is solidarity that gives us the desire to achieve the common good and protect the most vulnerable members of our communities, the principle of subsidiarity is particularly useful in helping us to achieve this preeminent goal. It protects us from large corporations and excessive government invading the most intimate spheres of our lives and inhibiting our freedom to reach our full potential as persons.
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Subsidiarity also protects civil society, the foundation of a strong democratic culture. It recognizes the inevitable need for communities between the person and the state, the inherent duties that exist within these communities, and the threat to these posed by tyrannical regimes, kleptocracies, and other forms of domination by powerful interests.

The full article can be read here.