. . . "Trusts" . . . . "conspiracy" . "price cartel" . . . . "trusts" . . "price-fixing cartel" . "colluding with other pyrite producers" . "Cartels" . . "Cartel" . "price fixing cartel" . . . "Cartel" . . . . . . . "anticompetitive association in the economy" . "quota cartel" . "cartels" . . . . "cartel formation" . . . . . "collaboration" . . . "cartel" .