offensive obstruction

Question
Bases loaded, ball is hit to the short stop.  in the act of fielding the ball the runner from second runs into the short stop and short can't make any play.  It was called tonight against the defensive team since the short stop was in the base path.  I say the short stop has the opportunity to make a play regardless.  If this is a dead ball does a run score?  how should this have been called?

Answer
Alan,

In your scenario, F6 has the absolute right to any spot on the field.  ANY act whether intentional or not by the offense the prevents F6 from playing the ball as they choose is interference on the runner.  The runner that interferes is out, the ball is dead, all runners return to the last base touched prior to the interference unless they are forced to advance by the batter or a preceding runner that was forced to advance.

It should have been, runner on third returned to third, runner on second called out, runner on first forced to second, batter on first.  No run scores

Tom