("vestibüülipoliitikud")

olemus
huvirühm, mis püüab enda kasuks mõjutada
seadusandlust või riiklikku rahastamist

Wiktionary:
3. a class or group of people who try to influence public officials; collectively, lobbyists
The influence of the tobacco lobby has decreased considerably in the US.

ülevaateid
https://www.studysmarter.us/explanations/politics/uk-politics/lobbyists/

https://en.wikipedia.org/wiki/Lobbying

https://www.oecd.org/corruption/ethics/lobbying/

http://lobbyingtransparency.net/lobbyingtransparency.pdf

https://www.europarl.europa.eu/EPRS/Transparency_of_lobbying_in_Member_States.pdf