volunteer organization

Translations
волонтёрская организация
They are part of a volunteer organization that provides free meals to the homeless.
Они являются частью волонтёрской организации, которая предоставляет бесплатные обеды бездомным.
Definitions
A volunteer organization is a group or entity that is formed to provide services or support to a community or cause, primarily relying on the efforts of unpaid individuals who offer their time and skills to help achieve the organization's goals.
Words
volunteer

adjective
волонтерская
organization

noun
организация