The original Magnitsky Act of 2012 was expanded in 2016 into a more general law authorizing the US government to sanction those found to be human rights offenders or those involved in significant corruption, to freeze their assets, and to ban them from entering the US. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.