English version

special interest group in Groupings topic

From Longman Dictionary of Contemporary Englishspecial interest groupˌspecial ˈinterest ˌgroup noun [countable]  PPGa group of people who share the same political or business aims, and who try to influence the government to help them with those aims
Examples from the Corpus
special interest groupRecruiting the practices through a special interest group and through self selection is likely to have biased results.