There is however the International Covenant on Civil and Political Rights, which is an international treaty. However, in practice, the ICCPR functions much like

There is however the International Covenant on Civil and Political Rights, which is an international treaty. However, in practice, the ICCPR functions much like the UDHR - a statement of principles rather than a treaty which provides for proper enforcement. The US apparently specifically indicated when it ratified the ICCPR that it didn't consider the treaty "self-executing" as a matter of US domestic law and thus you can't enforce it directly in the US courts.