Citizens Against The Large Hadron Collider is a non-profit organization established for the purpose of using legal action to prevent the operation of the Large Hadron Collider (LHC) until further safety tests are conducted.
The LHC is a particle accelerator located on the France/Switzerland border; it has been dubbed the largest, most expensive, most powerful experiment ever attempted, certainly dwarfing all particle colliders ever built before, both in terms of size and power.
Some experts fear that the risk of operating the LHC disproportionately outweighs anything science might gain from this experiment. It is not possible to know what the outcome of the experiment will be, but even CERN (the European Organization for Nuclear Research) scientists concede that there is a real possibility of creating destructive theoretical anomalies such as miniature black holes, strangelets and deSitter space transitions. These events have the potential to fundamentally alter matter and destroy our planet.
http://lhcdefense.com/lhc_risks.php