U.S. Arms Sales and Human Rights: Legislative Basis and Frequently Asked Questions [Updated May 6, 2019] [open pdf - 401KB]
From the Document: "U.S. law establishes the conditions under which the U.S. government and U.S. commercial entities may sell defense articles to foreign countries. This In Focus provides an overview of the main laws and policies that may limit such sales on the basis of human rights concerns."
CRS In Focus, IF11197
Congressional Research Service: https://crsreports.congress.gov/