DES MOINES, Iowa (Tribune News Service) â For two decades, a man referred to only as Calvin has been proclaiming the word of God in the charming and orderly, 11,000-population northwest Iowa city of Spencer. For some of those years, he has done so in the heart of Spencerâs main street, along Grand Avenue. To hear a foe tell it, he does it twice a day at various hours, in nice weather when people would leave their windows open. And he gets loud. For residents of the apartments above the businesses, it can sound as though heâs screaming inside, the woman told me. She asked not to be named because she is worried about being perceived as anti-Christian.