Watergate scandal
Abu Ghraib prison *****
Agent Orange in Vietnam
Almost did operation northwoods
My Lai massacre
9/11
Iraq genocide
Illegal mass surveillance of American citizens by NSA and other intelligence agencies
Lying about Iraq having WMD's
Black jails
Operation Condor
Being a big reason why ISIS exists (they should have left the middle east and all that oil alone)
Guantánamo Bay
The NSA monitors all kinds of stuff on internet and cellphone activity. They can gather information without a warrant. They can spy on people and monitor their activities remotely.
Theres a massive list of responses that could be said to this.