U-Visa
The U nonimmigrant status (U visa) is designated for victims of certain crimes who have suffered mental or physical abuse and are helpful to law enforcement or government officials in the investigation or prosecution of criminal activity. The U Visa is intended to strengthen the ability of law enforcement agencies to investigate and prosecute cases of domestic violence, sexual assault, trafficking of aliens and other crimes.

T-Visa
The T Nonimmigrant Status (T visa) is for those who are or have been victims of human trafficking. It allows victims of human trafficking to remain in the United States to assist in an investigation or prosecution of human trafficking. Human trafficking, also known as trafficking in persons, is a form of modern-day slavery in which traffickers lure individuals with false promises of employment and a better life. Traffickers often take advantage of poor, unemployed individuals who lack access to social services.