Corporations are a threat to Democracy and society.

Citizens must have power over corporations because, by their nature, they act like psychopathic people. Corporations are amoral; they act purely for their own gratification without consideration for society, without empathy for people and without remorse for the consequences of their actions on others (see, Joel Bakan, The Corporation).
All individuals and bodies are supposed to be equal under the law, but the executives of Corporations, in their effort to maximise the dividend to their shareholders (and thus keep their own position secure), wield the power and influence of their companies to effect the legal and socio-political environment of a country to meet their needs rather than develop the fundamentals of the business itself. Thus Unionisation is either legislated out of existence, or emasculated, sometimes in breach of acknowledged principals of Human Rights.
Where a corporation finds the situation in a country uncomfortable it is quite happy to ‘up sticks’ from that country. According to the BBC’s Analysis programme, even China can allegedly be cowed by the power of Corporations. It seems that the Chinese hierarchy realises that the country has a pollution problem but does not want to apply legislation restricting corporate pollution for fear of these companies moving to Vietnam, and the greater freedom to pollute there. 
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This presupposes that corporations can act in a manner that is unrestrained by law, commercial forces and public opinion. The law of tort restrains companies from being able to inflict unrestricted damages on people. For example, parties injured by cars and drugs are able to sue the corporations who manufacture these products.products. 
 
The ability of companies to "up sticks" is a call for greater international co-operation to take a strong stand on employment and environmental issues, not for dissolving the companies which contribute vast amounts to national economies.