Conn. Gen. Stat. § 11-35: Penalties for injuries.

The city council of such city may pass ordinances imposing suitable penalties for damaging the grounds or other property of such library and for damaging or failing to return any book belonging to such library. Each library director or board of trustees, having charge or control of such library or property, shall post in one or more conspicuous places connected therewith a printed copy of this section.