You might think that, having been raised a mile from where10workers were killed and30more were shot by police while picketing a steel plant, I would have heard of such a tragedy. More confounding, my great-uncle, Eddie Marasovic, was wounded by a police bullet in that violent affair that would become known as a massacre. Yet I knew nothing of it.It happened in May,1937, before I was born, on the prairie outside the Republic Steel plant on Chicago’s East Side.