Death Squads are the simple name given to intelligence agencies around the world-- CIA, MI6, Mossad, etc. there are many and their names change.

This is an interesting article on the Mossad, to learn about their training and methods.

When the deep state wants to carry out a False Flag attack on their own citizens, they employ a team or teams from another country; they don't use their own intelligence agency. This is why many claim Mossad agents were employed on 911.