Nestle...

I spent a summer when I was in school working in a candy factory, I saw toooooo much chocolate candy that summer so I only eat chocolate at EAser time now.
Chocolate Bunnies Rule
 
In recent years, there has been a push for manufacturers to stop using palm oil (vegetable oil) in their chocolate. Some companies have already stopped using it, but whether that affects the actual taste or not, I don't know. But it was the first thing I could think of.



http://www.roamingtales.com/2010/03/19/sustainable-food-web-dust-up-over-nestle-and-palm-oil/

Chocolate - Ethical Consumer Guide
Yup!

I think Hershey's made Cadbury's under license in the US - and swapped Cocoa Butter for sugar, so it didn't taste as nice, and lost the trademark chalkiness. :(
 
I've been boycotting Nestle since 1980. It's a disgustingly bad corporate citizen.