it's called unsporting behavior now and that covers whatever they want at there own discretion, the most famous one of all was Georgie Best heading the Ball out of Gordon Banks hands in a Northern Ireland v England game, might be on YouTube, also remember Gary Crosby doing it playing for Forest against City, both goals were disallowed.
That rule should also make 'shielding that ball', a foul again then. Blocking an opponent from getting to the bal whilst making no attempt to play it has always been 'obstruction'. I have no idea when the rule changed but it gets on my t1ts!
