The phrase "infamous case" refers to a situation that is well-known for being bad, widely talked about, and often associated with negativity or notoriety. Full definition
The now infamous case discussed whether damages should be awarded to a man who supposedly became ill after discovering there was a dead fly in his water bottle. (slaw.ca)
(For those who need a reminder, the beating of Rodney King was one of the most infamous cases of police brutality of the»90s.) (relevantmagazine.com)
Probably the most infamous cases in recent years have occurred off of the Somali Coast and the Gulf of Aden. (travelblog.org)