Great observation, Signor Vitelli!
I vividly remember reading both those graphic accounts and hadn't connected the two...but perhaps the garroting was fondly referred to as an 'Ex-Lax' killing back in those days. Either that or Richard Castellano, who played Clemenza, borrowed the ex-lax phrase directly from the book.
JGeoff, you've got until April 10th. Time to get an 'ex-lax' instant graemlin list.
*** NOT *** !!!