Delivery people whose jobs were obviated by refrigeration

• Block parties?
• Old cold-block bringers
• They no longer "cometh"
• Hired killers, in slang
• Erstwhile deliverers
• They cameth and wenteth
• Kitchen visitors of yore
• Pursuers of goals

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Iceman \Ice"man\, n.; pl. Icemen . A man who is skilled in traveling upon ice, as among glaciers. One who deals in ice; one who retails or delivers ice.

Wiktionary Word definitions in Wiktionary
n. (plural of iceman English)