Quarantine meaning and the law

Quarantine meaning
a state, period, or place of isolation in which people or animals that have arrived from elsewhere or been exposed to the infectious or contagious disease are placed.
According to HHS, to Isolation and quarantine, are public health practices used to protect the public by preventing exposure to people who have or may have a contagious disease.

Isolation separates sick people with a contagious disease from people who are not sick.
Quarantine separates and restricts the movement of people who were exposed to a contagious disease to see if they become sick. These people may have been exposed to a disease and do not know it, or they may have the disease but do not show symptoms.

As per statnews.com, Explaining a mass quarantine – What does it mean to ‘shelter in place’? And who has the power to call for it?
Officially, the definition of “quarantine” is very specific: It’s the seclusion of a person potentially exposed to a disease for a period of time to see if they become infected. A person under quarantine typically stays in one place to avoid nearly all contact with the outside world. When such quarantine is ordered by the government, it’s illegal to violate them: Breaking a federal quarantine is punishable by a fine or imprisonment, according to the Centers for Disease Control and Prevention. An individual found violating a federal quarantine order could face a fine of up to $100,000, a year in jail, or both, according to a report from the Congressional Research Service.

Many states also have their own punishments for violating quarantine, though they vary widely.

Pursuant to the law tfah.org, State Quarantine, and Isolation Laws.
What diseases are subject to Federal isolation and quarantine law?hhs.gov