Poulantzas constructed a theory of class that stressed structures rather than individual personalities. This theory suggested a working class largely consisting of male industrial blue collar workers, and a large new middle class, which he called the "new petite bourgeoisie'.
Interactive World Wide Web Notes
Ed Grabb, fragment on Poulantzas (pp. 129-138) in Chapter 6, "Recent Perspectives on Social Inequality", in Theories of Social Inequality. 3rd ed. 1996.
Bob Jessop, Nicos Poulantzas. Macmillan, 1985.