This joint NGO Letter to the Core Group and Co-Sponsoring States to the initiative for the creation of a new multilateral treaty for the domestic prosecution of the most serious international crimes – or Mutual Legal Assistance (MLA) Initiative – was sent in response to the Draft Convention on International Cooperation in the Investigation and Prosecution of the Crime of Genocide, Crimes against Humanity and War Crimes. The letter was sent in the context of the Second Preparatory Conference of the MLA initiative (11-14 March 2019) and was signed by REDRESS, FIDH, ECCHR, Women’s Initiatives for Gender Justice, ICJ, Amnesty International and Parliamentarians for Global Justice.