The John Birch Society was assertive in its stance against Agenda 21. They had materials to share with members in communities to help dismantle agreed upon agenda 21 programming at the city/town level.
https://www.jbs.org/agenda-21-action-tools/
https://www.treehugger.com/environmental-policy/who-behind-agenda-21-paranoia-how-can-we-fight-back.html
https://www.huffpost.com/entry/agenda-21-sustainability-_b_1523118
https://www.splcenter.org/hatewatch/2011/12/05/john-birch-society-%E2%80%98agenda-21%E2%80%99-stealth-plot-steal-freedom