Simple categories matching grassroots:

• institution,
• group,
• effort,
• event,
• activity,
• organization,
• cause,
• organisation,
• level,

Members with property grassroots:

• black_eagle,
• craft_cooperative,
• social_movement,
• postcard_campaign,
• widow_group,
• pet,
• refugee_association,
• rally,
• plant_sales,
• jamboree,
• farmer_organization,
• program_funding,
• golf_tournament,
• craft,
• peasant_league,
• family,
• school,
• gasp_group,
• feminism,
• church,
• development,
• arm,
• organization,
• house,
• family_fair,
• community_benefit,
• police,
• agricultural_cooperative,
• ethnic_coalition,
• skill_training,
• event,
• neighborhood_association,
• act,
• cultural_event,
• technology,
• woman_group,
• diaspora_organization,
• nra,
• local_youth,
• neighbourhood_association,
• small_nonprofit,
• christian_coalition,
• neighbourhood_organization,
• neighbourhood_group,
• community_mediation,
• production_cooperative,
• national_rainbow,
• civic_organization,
• chinese_auction,
• community_outreach,
• fire_coalition,
• university,
• sport_club,
• campaign_rally,
• cdc,
• graffito_removal,
• supplementary_school,
• eagle_forum,
• sport_team,
• orphanage,
• parent_group,
• community,
• reading,
• community_club,
• parade,
• resident_association,
• peace,