Pro-slavers begin to organize themselves as West Indian Commitee to fight for slavery. These individuals believed that without slavery the entire economy would collapse. Both sides pro- and anti-slavery, went to parliament to fight on their own behalfs. After years of hearings, Clarkson provided a multitude of evidence and testimonies about the brutality and unequality of the slave trade. This was the best non fiction anti-slavery work of all time which was used 60 years later by abolitionists in America.