When a fair fly ball is intentionally dropped by a fielder, what action is taken regarding the ball?

When a fair fly ball is intentionally dropped by a fielder, the appropriate ruling is that the ball is considered dead, and all runners must return to their bases. This action is taken because intentionally dropping a fly ball is regarded as an act of deception. The intent behind this rule is to ensure that the defensive team cannot gain an unfair advantage by manipulating the situation to their favor. Therefore, when a fielder intentionally drops a fly ball, it nullifies any potential play and protects the runners' positions on the bases. This ruling maintains the integrity of the game and upholds fair competition, ensuring that plays involving batted balls are conducted in a straightforward manner.