Not sure if anyone posted this already, but here is a list of anti-nuclear groups that have operated in the US:
As for whether they have political power or not in the US, I’m going to go with the plain fact that our nuclear industry is dying and has been so for decades now, that it’s practically impossible to build new nuclear plants today and that this doesn’t look to be changing anytime soon and that in the aggregate, the above groups have pretty much been able to achieve their goals of no new nuclear plants an, in many cases, getting rid of older plants before their time. In addition, they have been able to block any sort of consolidated nuclear waste storage facility. I’d say that, given those things, that demonstrates some level of political power within the US. [Alliance for Nuclear Accountability[5] Alliance for Nuclear Responsibility[6][7][8] Arms Control Association.[9][10] Beyond Nuclear Cactus Alliance (Utah)[11] Catfish Alliance (Alabama)[11] Citizen’s Committee for Protection of the Environment[12] Citizens Energy Council Clamshell Alliance[13] Coalition Against Nukes[14] Coalition for Nuclear Power Postponement Committee for a Nuclear Free Island Committee for a Nuclear Overkill Moratorium[15] Committee for Nuclear Responsibility[16][17] Concerned Citizens Against the Bailly Nuclear Site Corporate Accountability International[18] Council for a Livable World[19] Crabshell Alliance (Seattle)[11] Critical Mass[20][21][22] Don’t Make a Wave Committee Economists for Peace and Security[23][24][25] Environmental Coalition on Nuclear Power[12] Federation of American Scientists[18] Friends of the Earth[26][27] Greenpeace[28] Heart of America Northwest[18] Institute for Energy and Environmental Research[29][30] Lawyers’ Committee on Nuclear Policy Maryland Public Interest Research Group[31] Mothers for Peace[32][33][34] Musicians United for Safe Energy[35][36][37] Nevada Desert Experience[38] New England Coalition[39][40][41][42][43] North Anna Environmental Coalition[12] Nuclear Age Peace Foundation[44] Nuclear Control Institute[45] Nuclear Disarmament Partnership[18] Nuclear Energy Information Service[46] Nuclear Energy Information Service of Chicago (NEIS) Nuclear Information and Resource Service[47] Nuclear Policy Research Institute[18] Nuclear Threat Initiative[18] Nuclear Watch of New Mexico[18] Nuclear Watch South[18] Oystershell Alliance (New Orleans)[11] Palmetto Alliance (South Carolina)[11] Peace Action[48] People’s Alliance for Clean Energy Physicians for Social Responsibility[49][50] Pilgrim Watch[51] Plowshares Movement[52] Proposition One Campaign for a Nuclear-Free Future[53] Public Citizen[54][55] Red Clover Alliance (Vermont)[11] Riverkeeper[56] Rocky Flats Truth Force[57] Seneca Women’s Encampment for a Future of Peace and Justice[18] Shad Alliance[58][59] Shundahai Network[18] Sierra Club[60][61][62] Southern Alliance for Clean Energy[63][64] Tri-Valley CARE[18] Two Futures Project[65] Western States Legal Foundation[66] White House Peace Vigil[67] Wisconsin Project on Nuclear Arms Control[68] Women Strike for Peace[69][70] Women’s International League for Peace & Freedom, US Section[71]"]Here](Specific groups Groups include: Abalone Alliance[4) is another Wiki on anti-nuclear organizations, though this one includes groups outside of the US.