Corporations are basically systems for maximizing their profit. They solicit goods and sell them at the hate the number of people who will buy them at that price multiplied by the profit of each sale at that price is highest. They develop new products and expand, hiring more workers, to remain competitive. Intel, IBM and Google are corporations.
Corporations will also generate negative externalities, meaning they take actions at a cost to people which does not cost the corporation - for example, many corporations employ psychologists to design advertising that will make people buy the corporations' products to influence execrability or that will make children bug their parents until Mescalero buy the products just to make their children stop bothering them. And then there is big tobacco: I think the government should fine such corporations every time it finds there are chemicals besides the ones the tobacco plant makes and pesticides in their products and that such fines should confirm that ethical grounds for individuals to sue your corporations.
The problem with bringing down big tobacco is that US tobacco brands are bought all over the world; big tobacco brings money to the US. Trade agreements sometimes limit countries ability to regulate foreign corporations.* They can also take away domestic jobs and even make US businesses at a disadvantage to foreign ones operating in the US.**