asker: no one is saying you should read this book (lol), but it was a big deal among certain folks back in the day (it ages funky to know about it, as it does me!). here is what the wiki says:
In it Mills calls attention to the interwoven interests of the leaders of the military, corporate, and political elements of society and suggests that the ordinary citizen is a relatively powerless subject of manipulation by those entities.
The book is something of a counterpart of Mills' 1951 work, White Collar: The American Middle Classes, which examines the then-growing role of middle managers in American society. A main inspiration for the book was Franz Leopold Neumann's book Behemoth: The Structure and Practice of National Socialism in 1942, a study of how Nazism came into a position of power in a democratic state like Germany. Behemoth had a major impact on Mills and he claimed that Behemoth had given him the "tools to grasp and analyse the entire total structure and as a warning of what could happen in a modern capitalist democracy".
I think there's an argument that the insights of the book have percolated through the left, and therefore (?) into anarchist circles. the helpless individual is certainly a premise for the assumption that organizations (ie large numbers) are needed to change anything.