Answer:
Yes, blockbusting
Step-by-step explanation:
A realtor putting up an advertisement that says "sell now before it's too late" can be in trouble for such advertisement as the realtor is creating fear/panic in the minds of the inhabitants of the neighborhood.
The realtor will be charged under the premise of blockbusting. Blockbusting is a business process in the USA in which real estate agents and developers convince property owners to sell their properties at low or cheap prices by creating fear in the property owners about racial minorities invasion of the neighborhood.
Simply put, blockbusting is the creation of panic in property owners about the invasion of their neighborhood by racial minorities , hence the need to sell their properties for a cheap price.
I hope this helps.