Bangladesh, Aug. 28 -- The Trump administrations latest counterterrorism measures represent a significant shift in how Washington approaches politically motivated violence. Rather than focusing exclusively on individuals who carry out attacks, the administration is targeting the technological and financial infrastructure that can enable extremist networks to communicate, organize and operate across borders.

On August 26, the US Department of the Treasurys Office of Foreign Assets Control sanctioned Autistici Inventati, an Italy-based organization that provides digital infrastructure and services to violent far-left extremist groups. Treasury said the collective offers website hosting, encrypted email, chat and video-conferencing services...