Question

what is hoarding and why it is illegal

Answer 1

However, if the speculator's intent is to corner or otherwise monopolize a commodity, then it may be considered an illegal act. In 1933, owning more than $100 worth of gold became a criminal act called hoarding, but holding/hoarding as much gold as you can afford to buy was legalized again in 1974.

Answer 2

Hoarding is the illegal practice of displaying a large board for advertising.If it is used to corner a group of people then it is considered illegal