HIV, viral hepatitis and STI epidemics, particularly among people who inject drugs and other key populations, continue to be fuelled by laws and policies criminalizing sex work; drug use or possession; diverse forms of gender expression and sexuality; stigma and discrimination; gender discrimination; violence; lack of community empowerment and other violations of human rights. These sociostructural factors limit access to health services, constrain how these services are delivered and diminish their effectiveness.