In the recent past, the IMF has released papers on the impacts of fiscal tightening on inequality -- see a summary here and to the research on which it is based here and here.
The IMF has also looked at the impact of capital account liberalization on inequality -- see this article and Vox post.
The Berg-Ostry paper showed that inequality lowers the duration of growth spells. The new paper makes the case that redistribution efforts to lower inequality are not harmful to growth.
