Laws that are overly broad in their reach might have a chilling effect on the exercise of freedom of expression.

This is true.

For example, this is the case with hate speech laws. Since it is not precisely defined or understood what hate speech actually constitutes, many and no things at the same time can be considered to be hate speech, so it can be used politically to reduce the freedom of expression and the rights given to people by the first amendment.

African americans at the time just came out of slavery and needed money to provide for there families. so they joined for the money mainly.