People will be dismissed, punished, ruined, etc: If eventually the authorities catch up with you, no heads will roll/ I promise you: if this package is not delivered on time, heads will roll
[1930+; the source is a quotation from Adolf Hitler]
Idioms and Phrases with heads will roll
heads will roll
Someone will be severely punished, as in If no one meets the chairman's plane, heads will roll. This hyperbolic expression alludes to the punishment of being beheaded.