After World War II, one may want to include Maximillen Rubel's Marx Without Myth (an extremely helpful chrononical survey of Marx's activities which I read last night only to learn of the deafening silence Marx's magnum opus was met with). Also worth checking out is Rubel on Marx: Five Essays, ed. O Malley. Rubel's history of Marx's attempt to begin and complete his economics is charged and inspiring. I found the sections of Jerrold Siegel's bio which I did read (e.g., on inversion in *Capital*) quite stimulating.
I don't know which bio is supposed to make the claim that Marx's outrage at society stemmed from the humiliation his family suffered upon its forced conversion.
best, rakesh