Such casuals call at the presbytery - we are particularly careful to keep our own addresses secret. The priest will then ring one of us to come over to interview the person, or give him a time to come back when this can be done. If he gives an address we arrange to visit him. Frequently he has never been heard of there. Our time has been wasted but not the alms entrusted to us.
Some people are happier and more effective working alone.
In other cases it may be easier to set up a group for charitable work within an existing society. Many of these must exist already. But it may help if I explain how a parish conference of the Society of St. Vincent de Paul operates. The organization and procedure is simplicity itself. There are no frills.