This page disambiguates.

The metal lead (noun) is toxic when ingested. Despite this, the Romans used it for a sweetener, and many went quite mad.

A lead (noun) or leash is a physical means by which an animal is led by its master.

To lead (verb) a human group - see lead team - is to focus their efforts and filter their concerns. It is not the same as to manage them. See leadership, leader and many links from there.