It de facto allow foreign nationals to sue parties with sufficient ties to the US (most black money ends up in the US in some way) in Federal Courts for human rights violations committed outside the United States
We also have the Magnitsky Act that allows US sanctions on foreign politicians found to have been corrupt (and it's named after the accountant who Jamison Firestone hired to manage his Russian business and who was assassinated for his investigations into corruption and malfeasance)
There are a slew of additional laws, acts, and precedents that allow the DoJ to step in (or allow foreign nationals to push the DoJ to step in) if bad practices arise.
Unsurprisingly, both China and Russia have been very vocally opposed to both acts, as it makes laundering ill gotten gains much harder.