Malaysian authorities have upped their ante on the use of sedition laws, hauling in five editors in a deepening crackdown on dissent that critics say is aimed partly at shoring up Premier Najib Tun Razak’s standing inside his own political party. The five are from The Malaysian Insider and The Edge Media Group, which owns the independent news portal, kicking off a storm of protest from press and human rights organizations that charge the arrests were aimed at silencing voices critical of the government and particularly its fiasco over its state-backed investment fund 1Malaysia Development Bhd,