Bakunin differed from Marx's on the revolutionary potential of the lumpenproletariat and the proletariat. Marx also described two other classes, the petite bourgeoisie and the lumpenproletariat. Vladimir Lenin called socialist attempts to recruit "lumpenproletariat" elements "opportunism". The lumpenproletariat is the underclass, those with little to no social status. Karl Marx and Friedrich Engels are generally considered to have coined the term "lumpenproletariat". The latter is today considered analogous to the Marxist term "lumpenproletariat". Pasolini's first novel, "Ragazzi di vita" (1955), dealt with the Roman lumpenproletariat. He spearheaded Ainu Revolution Theory, grouping the Ainu within the lumpenproletariat. He argued that the "lumpenproletariat" had a dual nature. The third group described by Fanon are the lumpenproletariat. Pulido claims the emphasis the Black Panthers put on the "lumpenproletariat" was the party's hallmark.