G. Edward Griffin is not a very reliable source to depend upon for quotes.  If someone can actually trace the alleged Forbes quote to an authentic original source, then that should be used to replace Griffin as the source.  Otherwise the quote should be taken out if it can't be verfied from a more primary source.  Griffin, Eustace Mullins, and several others connected with them used to run a cottage industry of faked quotes, and some of those still circulate.  Unless one can track a quote down to a more dependable source, it shouldn't be treated as authentic coming from them.