The infield fly rule is only in effect with runners on first and second or first, second, and third. The rule is put into effect when there is a pop up in the infield that is catchable. When the umpire yells, "Infield fly, batter's out" He means that the batter is out and the runner's don't have to go even if the fielder drops the ball.
This is to protect the runners so they don't have to decide whether to stay on first base in case the fielder catches or to go in case he drops. If the fielder drops the ball the team in the field would have plenty of time to get the lead runner(s).
No it was not a rule in 1956. Rule 4.03 became a rule years later when Keith Hernandez revolutionized the game of baseball, Fact !
there is none in the MLB ... there is a MERCIE RULE in little league ...
No, there is no 10 run rule in MLB.
the rule book
the year was 1898.
Keep your eye on the ball.
There is no such rule in College baseball.