What was the Idler's Club?

The Idler's Club was a group of older men, who spent a lot of their time as observers in the courtroom.

I found myself in the middle of the Idlers’ Club and made myself as unobtrusive as possible. This was a group of white-shirted, khaki-trousered, suspendered old men who had spent their lives doing nothing and passed their twilight days doing same on pine benches under the live oaks on the square. Attentive critics of courthouse business, Atticus said they knew as much law as the Chief Justice, from long years of observation. Normally, they were the court’s only spectators, and today they seemed resentful of the interruption of their comfortable routine.