National Ugly Mugs (NUM) is an organization that collects reports of violence against sex workers and circulates anonymous alerts to warn others. NUM's services are important because sex workers often face stigma and negative treatment by police that discourages reporting crimes. NUM helps bring perpetrators to justice while supporting victim's choice to report or not. It also identifies health issues, like linking an assault to an offender with tuberculosis, allowing for quick treatment. NUM has helped convict many violent criminals and refers sex workers to health and social services, but continued funding is needed to sustain this vital work.