The Clamshell Alliance is an anti-nuclear organization co-founded by Paul Gunter, Howie Hawkins, Harvey Wasserman, Guy Chichester and other activists in 1976. The alliance's coalescence began in 1975 as New England activists and organizations began to respond to U.S. President Richard Nixon's "Project Independence" which sought to build 1000 nuclear power plants by 2000.
The group conducted non-violent demonstrations against nuclear power in New England in the late 1970s and 1980s. In May, 1977 over 2,000 Clamshell protesters occupied the Seabrook Nuclear Power Plant construction site. 1,414 of these activists were arrested and held in jails and National Guard armories for up to two weeks after refusing bail.
In 2007, veterans of the Clamshell Alliance marked the 30th anniversary of its founding with the creation of a website called, "To the Village Square: Nukes, Clams and Democracy", which relates the story of the Clamshell Alliance and why it matters today. The Clamshell Alliance opposes all nuclear power in New England.
In July 1976 the Clamshell Alliance adopted a Declaration of Nuclear Resistance as a guiding set of principles in a meeting of 60-75 activists.
The alliance conducted non-violent demonstrations in the late 1970s and 1980s. On August 1, 1976, 18 New Hampshire residents were arrested for criminal trespass and disorderly conduct in Clamshell's first civil disobedience action on the Seabrook site. Three weeks later, a second occupation involved 180 New England residents who were arrested and held in a local armory overnight. In May, 1977 over 2,000 protesters occupied the Seabrook Nuclear Power Plant construction site. 1,414 of these activists were arrested and held in jails and National Guard armories for up to two weeks after refusing bail. Clamshell activists used this detention for training and networking, and long considered the detention a blunder on the part of Republican Governor Meldrim Thomson, Jr.
Richard Asinof wrote:
- The overwhelming success of the Clamshell Alliance's occupation can be attributed to three factors; the planning and leadership of the Clamshell Alliance itself; the strength of the affinity group and the spirit and discipline of the occupiers; and the strong impact that women in key leadership roles exerted on the events. 
In later years, New Hampshire authorities minimized the impact of mass civil disobedience at the Seabrook plant by treating activist trespass as a violation, and allowing community service in lieu of fine. Actions were still media events capable of swaying public opinion, but their larger impact was limited. Clamshell Alliance members attempted to have their actions taken more seriously by the courts, and began staging sit-ins of the office of Republican Governor Judd Gregg. While this action resulted in jail time for criminal trespass, the local courts would not rule on the question of "competing harms" or the "Right of Revolution" granted by the New Hampshire Constitution. Activist Guy Chichester eventually sawed down a Seabrook Station emergency warning siren pole, resulting in charges of "criminal mischief", a Class B felony. Although there was no doubt that he had cut down the pole, Chichester was acquitted. In his appeal Chichester's lawyer Patrick Fleming argued that according to article 10 of the N.H. state constitution, any citizen has a right to act to protect his or herself when the state fails to do so, which is known as the "Right of Revolution:"
[Art.] 10. [Right of Revolution.] Government being instituted for the common benefit, protection, and security, of the whole community, and not for the private interest or emolument of any one man, family, or class of men; therefore, whenever the ends of government are perverted, and public liberty manifestly endangered, and all other means of redress are ineffectual, the people may, and of right ought to reform the old, or establish a new government. The doctrine of nonresistance against arbitrary power, and oppression, is absurd, slavish, and destructive of the good and happiness of mankind.
The Clamshell Alliance was an inspiration to other communities who wished to organize opposition to nuclear power plants. Hundreds of groups with similar names, such as the Abalone Alliance in California, adopted similar non-violent organizing techniques to oppose nuclear power and nuclear weapons around the country and internationally.
In 1978 the Clamshell Alliance split after leaders in the group agreed to call off a large disobedience planned at the power plant site that was expected to draw upwards of 20,000 people. The state government of New Hampshire feeling that a massive arrest on the site would overwhelm the state with the costs of hiring police from neighboring states and jail and also court expenses offered to let Clamshell hold a solar power fair and concert on the site. Many Clamshell members felt that the agreement was a betrayal of the democratic consensus process that was an integral part of Clamshell's organization just at the time when the state and the Public Service Company of New Hampshire appeared at their most vulnerable. The dissidents broke off to form another organization to be called the Coalition for Direct Action at Seabrook (CDAS) which would take more militant but still nonviolent action on the site.
Composed of several "clusters" throughout New England and metropolitan New York that were themselves composed of smaller "affinity groups", CDAS decided using the consensus process, to attempt to occupy the power plant site. The first attempted occupation was planned for October, 1979 and activists agreed that they would be willing to tear down fencing protecting the site but avoid fighting with police when confronted and also try to avoid arrest. The new strategy was controversial and many former Clamshell members decided to not get involved once the more confrontational tactics were decided on. Many of the demonstrators would equip themselves with helmets and gas masks in anticipation of police violence against them and the critics argued that this would be too provocative.
Nevertheless, the attempted occupation drew over 3,500 activists who felt energized after growing disillusionment with nuclear power with the near meltdown at the Three Mile Island nuclear plant in Pennsylvania a few months earlier. The activists made several attempts to get through fencing and at one point entered the site but were met by state police equipped with pepper spray, tear gas, and in one case, a fire hose spraying water on them. Dozens of arrests were made. The occupation was not successful in taking over the site but drew much national media attention.
CDAS, regrouping over the following winter, again attempted an occupation on the site in April, 1980. This time, a smaller group of activists, about 2,000 met police at the fences but were also repulsed by the police.
The following year several hundred attempted to block the delivery of the first reactor containment vessel to the site but police kept the roads clear. The Coalition dissolved not long afterward after stirring a lot of debate in the anti-nuclear movement about what could be considered appropriate tactics in a non-violent movement.
Public Service Company of New Hampshire, the utility with majority ownership of the Seabrook Station, was bankrupted by the project. Governor Hugh J. Gallen had signed legislation prohibiting the utility from billing consumers for the costs of construction work in progress (CWIP), and the Three Mile Island accident had increased awareness and added the requirement for an evacuation plan prior to commissioning. In the end, only one of the two planned reactors went on line.
In 2007, veterans of the Clamshell Alliance marked the 30th anniversary of its founding with the creation of a website called, "To the Village Square: Nukes, Clams and Democracy", which relates the story of the Clamshell Alliance and why it matters today. In addition, a book and a travelling exhibit are planned.
In the 1997 film Grosse Pointe Blank, a Clamshell Alliance poster hangs on the bedroom wall of Minnie Driver's character. The poster was created in the fall of 1976 for a Clamshell-sponsored Alternative Energy Fair near the site of the Seabrook plant. This event followed the initial Clamshell civil disobedience actions of August 1 and August 22 of that year.
The Clamshell Alliance is humorously referenced in Arlo Guthrie's song "The Story of Reuben Clamzo and His Strange Daughter in the Key of A" released in 1978 on the album One Night as an organization of citizens fighting off invasions of gigantic walking clams in Colonial America.
See also 
- Macy Morse
- Anti-nuclear movement in the United States
- Abalone Alliance
- Shad Alliance
- List of anti-nuclear protests in the United States
- Michael F. Brennan
- The Siege of Seabrook
- To the Village Square
- Mark Hertsgaard (1983). Nuclear Inc. The Men and Money Behind Nuclear Energy, Pantheon Books, New York, p. 74.
- Michael Kenney. Tracking the protest movements that had roots in New England The Boston Globe, December 30, 2009.
- Guy Chichester, Clamshell Alliance Co-Founder, 1935-2009
- Clamshell Alliance - history and current activities
-  Lionel Delevingne's photographs- From Seabrook to Chernobyl 1976-2006
- University of New Hampshire collection of Clamshell Alliance papers
- Peacework Magazine: Clamshell Special Issue, July 1996 Intro & Editorial
- Peacework Magazine: Clamshell Special Issue, July 1996 Table of Contents
- Ecologia newsletter "Clamshell Alliance: Thirteen Years of Anti-Nuclear Activism at Seabrook", by Paul Gunter
- Seabrook Construction Site Occupation Page with timeline, scanned articles, essay and links about the Clamshell Alliance's activities