The collection at Calphurnia's church that day went towards Tom Robison's wife while he is in jail.  This was the black man that Atticus is defending in court.  He was accused of raping one of the Ewell girls.  That family is a trach family so Atticus knows what he is doing is right, but the town doesn't neccessarily agree.  The priest said they needed ten dollars.  They weren't going to let them leave until they had it.  They even "suggested" that some people pay more.  They even single out some and pretty much forced them to donate.  That is not right.  It's not a donation if it's forced.  what kind of church would force people to pay money and in front of everyone?