Children of the Corn 3: Urban Harvest (1995)

Soon after a childless couple adopts a pair of orphaned brothers, it seems alarmingly clear the boys are much more than they seem! With the immense power to hypnotize schoolmates into mindless followers and destroy any adult opposition, the younger boy continues the frightening campaign of terror that Isaac Chroner began. But there IS one person - the brave older brother - who can possibly stop the relentless destruction, setting up an awesome finale showdown between the powers of good and evil!