A　controlled　quantum　secure　direct　communication　protocol　(Zhang　et　al.　Int.　J.　Theor.　Phys.　48:2971-2976,　2009)　by　using　four　particle　cluster　states　was　proposed　recently.　The　aim　of　Zhang　et　al.　was　that　the　successful　realization　of　communication　between　Alice　and　Bob　needed　the　cooperation　of　a　controller,　Charlie.　However,　we　show　that　the　controller　Charlie＇s　role　could　be　excluded　unknowingly.　Using　fake　entangled　particles　and　Bell　measurement,　the　dishonest　Bob　who　generates　the　initial　signals　can　elicit　Alice＇s　secret　message　without　the　permission　of　Charlie.　A　possible　improvement　of　the　protocol　is　proposed.