Eldred v. Ashcroft (2003) [1] was bad enough (applying the 1988 copyright term extension to existing copyrighted works, including those about to enter the public domain), but there was also the Golan v. Holder (2012) [2] ruling allowing the same term extension to apply to foreign-made works that had already entered the public domain in the US.

[1] https://en.wikipedia.org/wiki/Eldred_v._Ashcroft

[2] https://en.wikipedia.org/wiki/Golan_v._Holder