FBI director Kash Patel announced the investigation Monday, two days after federal officers shot a protester, 37-year-old Alex Pretti, to death on a Minneapolis street. “I have infiltrated organizational signal groups all around Minneapolis with the sole intention of tracking down federal agents and impeding/assaulting/and obstructing them. No such evidence appears in the Signal messages that have been made public.”Other free speech advocates agreed. On its website, Signal says it is subject to lawful court orders, warrants or subpoenas asking for data. In response to a 2021 subpoena in California, Signal said it does not have access to messages sent through its app or the names of people in group chats.