The phrase should be air space containment it means to keep area used for air traffic clear of intrusion and the other phrase should be air traffic control which is managing the air traffic in the air space containment area to avoid collisions and other dangerous incidents whether accidental or intentional

Any controller that covers that particular airport, or if they are VFR "Flight Following", whatever radar controller that covers that area. In other words, helicopters are controlled by the same Air Traffic Controllers as normal traffic.

A air traffic controller.

to control air traffic

Air Traffic Chaos happened in 2007.