Interesting, here is a quote from the Philadelphia Inquirer article...
For reasons lost to history, the 1950 Open marked the only one of Merion's 19 USGA events in which the club's traditional wicker-basket flagsticks weren't used. He saw the flag tucked into the green's right corner, just beyond an ominous trap. Initially considering a 4-wood, Hogan feared challenging the hazard.