pressure group(n = noun.group) lobby, third house - a group of people who try actively to influence legislation;
is a kind of political entity, political unit
has particulars: national rifle association, nra

abelian group, abo blood group system, abo group, acetyl group, acoustic radiation pressure, acyl group, adapid group, age group, air group, air pressure, alcohol group, aldehyde group, alkyl group, allyl group, amino group, amphibole group, animal group, armed islamic group, arsenic group, arterial pressure, as a group, atmospheric pressure, azido group, azo group, barometric pressure, battle group, benzoyl group, benzyl group, biological group, blood group, blood pressure, bloomsbury group, cacodyl group, carbonyl group, carboxyl group, chemical group, colorado group, commutative group, compartment pressure, congo group, core group, corpuscular-radiation pressure, cyanide group, cyano group, diastolic pressure, elite group, encounter group, ethanoyl group, ethnic group, ethyl group, first of october antifascist resistance group, gas pressure, group, group a, group ab, group action, group amentiferae, group b, group captain, group centrospermae, group discussion, group dynamics, group insurance, group meeting, group o, group participation, group practice, group psychotherapy, group pteridospermae, group pteridospermaphyta, group theory, group therapy, harlech group, helium group, high blood pressure, high pressure, hydrazo group, hydroxyl group, in group, instantaneous sound pressure, interest group, intraocular pressure, islamic group, islamic group of uzbekistan, jazz group, kaplan group, ketone group, kin group, kinship group, laramie group, libyan fighting group, libyan islamic fighting group, libyan islamic group, linkage group, llandeilo group, low pressure, ludlow group, malaysia militant group, malaysian mujahidin group, mathematical group, methyl group, methylene group, military group, minority group, musical group, nitro group, occupational group, oil pressure, omomyid group, orange group, orly group, osmotic pressure, out group, peer group, phycomycetes group, play group, pop group, portage group, potsdam group, pressure, pressure cabin, pressure cooker, pressure dome, pressure feed, pressure gage, pressure gauge, pressure level, pressure point, pressure sensation, pressure sore, pressure suit, pressure unit, pressure wires, propyl group, psychotherapy group, quebec group, radiation pressure, rap group, revolutionary group, rock group, salafast group for call and combat, salafist group, scout group, skiffle group, social group, sound pressure, sound pressure level, splinter group, standard pressure, systolic pressure, t group, taxonomic group, terrorist group, turn up the pressure, united self-defense group of colombia, uranyl group, vapor pressure, vapour pressure, venous pressure, vinyl group, wenlock group, working group