Czech police said on Saturday they are investigating an anonymous threatening letter against presidential candidate Andrej Babiš. The letter contained live ammunition and explicit insults, Babiš told Czech news agency CTK. Babiš, a billionaire who founded the centre-right populist ANO 2011 (Action of Dissatisfied Citizens 2011) political party, said such threats against a political candidate and his family should have no place in a free society. Babiš is facing independent politician Petr Pavel, a retired army general and former top NATO official, in the run-off election for Czech president ne…