People who argue that government interferes with freedom of expression, free markets, and society, and thus should be limited to as few spheres of activity as possible, are best classified as

libertarians

Explanation:

Libertarians:-

They are the people who seek to maximize the political freedom as well as the autonomy. They emphasize the freedom of the choice, individual judgement and the voluntary organization. They uphold the liberty of the individual and the political parties as the core principle. They share skepticism of the state powers but also, they tend to diverge on the various scopes of the opposition which exits in the economic and the political systems.

Hence, the answer to this question is: - libertarians.