Who are the hidden team members on the GTA Online: The Diamond Casino Heist?

On the new casino heist, there are some team members that appear with a "hidden" icon and can't be selected. Who are the hidden members? How can I unlock them?

The hidden/unlockable crew members are:

Gunmans

Charlie Reed

Requires purchase of a Hangar.

Chester McCoy

Requires purchase of a Bunker or Arena Workshop.

Patrick McReary

Requires completion of freemode event, where you steal a police vehicle with Packie on the back and drop him in the designated location after losing the cops.

Drivers

Zach Nelson

Requires purchase of the MC Clubhouse.

Chester McCoy

Requires purchase of a Bunker or Arena Workshop.

Hackers

Yohan Blair

Requires purchase of the Nightclub.

Paige Harris

Requires purchase of the Terrorbyte.

Avi Schwartzman

Requires the destruction of all 50 Signal Jammers around the map.