> "During his trial in May 2019, prosecutors said Mr. Rahim, 42, used a messaging app called Zello to try to recruit the fighters and tell others to kill enemie

> "During his trial in May 2019, prosecutors said Mr. Rahim, 42, used a messaging app called Zello to try to recruit the fighters and tell others to kill enemies of the Islamic State, also known as ISIS." How'd they get the info from Zello?