The organization gets the hair from coiffeurs who sweep up and collect the hair from their customers.

该组织从理发师那里发，理发师清扫和收集们的顾客的发。

Well chez is the preposition that you use before the name of a person or before a direct reference to a person like chez vous or the hairdresser for example: " je vais chez le coiffeur" .

嗯，chez 是一个介词， 用在人名前或直接指代某个人之前，比如 chez vous 或理发师，例如：“je vais chez le coiffeur” 。