A is a person who attemps to influence government decisions, especally legeslation, on behalf of an intrest group

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

so they can differentiate themselves from others as they saw themselves as the superior race. the star was basically a symbol that meant you are a less of a person than i am because of my race. the star was also degrading for those who had to wear it because they were aware of this and the nazis used the notion to make them feel less like a person.