404 Media found multiple users of Zello, an app previously used by Jan. 6 insurrectionists, linked to ICE officials. An officer at the scene of an CBP official shooting a US citizen also used the app. Zello is a smartphone app that acts much like a push-to-talk walkie-talkie. Users can communicate directly with one another, or create and join larger channels with groups of participants. On its website, the app claims to have 5 million active monthly users. The app offers a free version that anyo