The Patients during free time. The Acutes are the ones who can function, where as the Chronics are the failures who cannot function properly, they are "Machines with flaws inside that can't be repaired."
Upon arriving McMurphy knows he isn't a Chronic. So he makes his way over to the Acutes.
McMurphy attempts to connect to the Acutes, he ends up intimidating them but doesn't let up.
"McMurphy sticks a big hand down in front of Billy, and Billy can't do a thing but shake it."
Mr. Harding asks Billy (the black haired one) if McMurphy has an appointment with him without looking anywhere in particular.
McMurphy and Harding arguing about who is crazier, using Billy as a mediator, by admitting that they voted for Eisenhower. McMurphy says that he plans to "vote for Eisenhower again this November." Thus earning Harding's respect.