A Spontaneous Unaffiliated Volunteer (SUV) refers to individuals who volunteer to assist community members, typically after a large-scale or well-publicized disaster. Because unaffiliated volunteers lack consistent training, and each volunteer's trustworthiness is unknown, SUV management can be very difficult, and the subject of a large amount of research and practice.
In many community organizing circles, the term "Community Volunteer" is preferred, emphasizing the community-centric nature of unaffiliated volunteerism.
References
Spontaneous Unaffiliated Volunteers Wikipedia(Text) CC BY-SA