There are probably precedents for "suspending" civil rights all over the place. The biggest one that comes to mind started during the early part of the US Civil War.
Pres. Abraham Lincoln, the so-called Great Emancipator, was also the Great Incarcerator. He suspended the Writ of Habeus Corpus. This meant people could be arrested and held indefinitely with no charges. A violation of due process.
When the Chief Justice of the US, Roger B. Taney, started to complain, Lincoln considered locking him up too.
Lincoln did manage to keep the Maryland General Assembly from meeting to vote on seccession from the US, by locking up many of its members, plus other prominent Marylanders, at Fort McHenry in Baltimore.
You have probably seen incidents during various urban riots where there are curfews and prohibitions about selling firearms, ammo, gasoline, liquor, etc.