How can the EU list Iran's IRGC as a terrorist organisation?

The National

…Some analysts such as Jason Brodsky, policy director of US non-profit organisation United Against Nuclear Iran, believe that the EU can list the IRGC as a terror group without waiting for a European court verdict. Mr Brodsky told The National that this has been done before…Mr Brodsky said that the EU currently lacked the political will to list the IRGC because officials were attached to reviving the now-defunct nuclear deal. “Iranian people are chanting: death to the IRGC. Standing with them would be a very powerful move,” he said.