We find that the sanctions have inflicted, and increasingly inflict, very serious harm to human life and health, including an estimated more than 40,000 deaths from 2017–2018; and that these sanctions would fit the definition of collective punishment of the civilian population as described in both the Geneva and Hague international conventions, to which the US is a signatory. They are also illegal under international law and treaties which the US has signed, and would appear to violate US law as well.