@randahl
They're back!
We used to call those "Bills of Attainder" in Britain: they were abolished around 1870. See https://www.legislation.gov.uk/ukpga/Vict/33-34/23/section/1/enacted
A rough definition is " A legislative act that punishes a specific person or group without a trial, declaring them guilty and imposing punishment, often including forfeiture of property and loss of civil rights".
The US beat us in 1788, with Article I, Section 9 of the Constitution: "No Bill of Attainder or ex post facto Law shall be passed" by Congress.
Of course they're therefor unconstitutional, but Mr Trump doesn't agree.
He is using the International Emergency Economic Powers Act (IEEPA) act, passed by Congress, to let him to impose economic sanctions on individuals, particularly in foreign policy contexts. These can include freezing assets, travel bans, and restrictions on transactions.