Even though it's late, I've decided to go ahead and nominate 
John Steinbeck's In Dubious Battle (1936, 302 pp.).
	Quote:
	
	
		| At once a relentlessly fast-paced, admirably observed novel of social unrest and the story of a young man's struggle for identity, In Dubious Battle is set in the California apple country, where a strike by migrant workers against rapacious landowners spirals out of control, as a principled defiance metamorphoses into blind fanaticism. Caught in the upheaval is Jim Nolan, a once aimless man who find himself in the course of the strike, briefly becomes its leader, and is ultimately crushed in its service. | 
	
 Amazon U.S., $12.99
Both e-book and audiobook are in Overdrive and available in all relevant countries. There's also a copy of the e-book at the Internet Archive.