As another friend, Rick Atkinison, writes in his background to the work:
The over-arching point of Mr. Clark’s critique was that the petty bourgeois intelligentsia, whether advocating for imperialism or socialism and regardless of the social structure within which they live, could only continue to exist as part of a parasitical strata. It is “parasitical” because in order to be “free” to pursue interesting ideas, conduct “principled” debate, research, write, etc. the intelligentsia must be supplied with the means of subsistence without “having to actually work for a living” (Ibid.). The essence of petty bourgeois ideological work, whether capitalist or socialist, then, is simply to define and proselytize “how the privileged status of their kind is to be secured.”
Tom writes in Chapter Two presented below:
By assuming the authority of Marx and Engels, Lenin also made an opportunist assumption of far greater proportion, an assumption shared by all the various socialist and communist trends: the authority of the middle-class socialist intelligentsia as a whole as the legitimate and trustworthy leadership of the working class movement. To have applied the same class criteria to Marx and Engels as Lenin applied to Kautsky and Plekhanov would have meant undercutting the final authority of the intelligentsia, since if even the most theoretically advanced intellectuals were at heart ordinary opportunists, the working class could not intelligently turn to this strata for political education and leadership.