Final answer:
Passage of zoning ordinances to control land use is an expression of the public interest known as police power.
Step-by-step explanation:
The action that is an expression of the public interest known as police power is passage of zoning ordinances to control land use. Zoning regulations are a common form of land-use regulation used by municipalities to divide areas into residential, commercial, and industrial districts. These regulations aim to promote the overall well-being of the community and control the development of property within their borders.