advocacy group

Từ điển Oxford Advanced Learner 8th

ˈadvocacy group 8 [advocacy group] BrE NAmE noun (NAmE)
a group of people who work together to achieve sth, especially by putting pressure on the government, etc, usually on behalf of people who are unable to speak for themselves
•an advocacy group for the rights of the mentally ill
compare ↑interest group, ↑pressure group