WASHINGTON — The U.S. on Monday imposed sanctions on an extreme right-wing online network, designating the “Terrorgram” collective a terrorist group and accusing it of promoting violent white supremacy. The U.S. State Department said in a statement that it had designated the group, which primarily operates on the Telegram social media site, and three of its leaders as Specially Designated Global Terrorists. The State Department said the group has motivated and facilitated attacks and attempted attacks by users, including a 2022 shooting outside an LGBTQ bar in Slovakia, a planned attack in 2024 on energy facilities in New Jersey and