The middle class I'm pretty sure
It would be a historical timeline because of the way the information is put.
The symptoms of farmworker exploitation and the more flamboyant aspects of farmworkers’ efforts to gain fair contracts from the growers have become quite well-known. Much less known by equally important is a story which deals with the nitty-gritty of the farmworkers’ struggle for economic dignity: their efforts to form a nation-wide farm workers union.