The law banned convicted felons from possessing "a dagger, dirk, switchblade, stiletto, straight-edged razor or any other dangerous or deadly cutting instrument of like character"—"It is the very overbreadth of such laws that renders them impermissibly vague."
There are far too many jurisdicional areas which govern knives.
A longer article which explores the question:
Crocodile Dundee (Rimfire Films 1986) "That's not a knife … That's a knife.".