Heads will roll.
This idiom or expression means:
People will get in trouble.
Employees will lose their job.
Players will get cut from the team. Etc.
Examples:
If the team keeps losing, heads will roll.
If we don’t get a new contract, heads will roll.
History:
"Heads will roll" is one of a whole series of expressions which come from old-fashioned beheading of criminals, including "getting the axe", "the axe is going to fall" and "being on the chopping block". However, "heads are going to roll" evokes the chaos and purging of the nobility and elite during the French Revolution, where thousands of people (including the king) were put to the guillotine.