If bad or wrong things that someone has done in the past have come home to roost, or if their chickens have come home to roost, they are now experiencing the unpleasant effects of these actions. Appeasement has come home to roost
If you say that someone rules the roost in a particular place, you mean that they have control and authority over the people there. Today the country's nationalists rule the roost and hand out the jobs. a place where birds rest and sleep rule the roost rule (4)