https://d3by36x8sj6cra.cloudfront.net/assets/images/book/large/9780/6154/9780615435848.jpg
Firing Line with William F. Buckley Jr.: Senator Dodd and General Klein
https://youtu.be/mKNNxsg-aC0 (48 min, 33 sec)
General K [JFK]
NCSWIC
https://d3by36x8sj6cra.cloudfront.net/assets/images/book/large/9780/6154/9780615435848.jpg
Firing Line with William F. Buckley Jr.: Senator Dodd and General Klein
https://youtu.be/mKNNxsg-aC0 (48 min, 33 sec)
General K [JFK]
NCSWIC
An observation from attending rallies is that those in the bleachers are hand-picked as the crowd passes through security screening. They choose a good representation of the population who are wearing interesting and acceptable clothing messages. That is why he refers to them as central casting since they are hand chosen.
There could be comms but this is how those seats are filled.