It was a poem published in Quadrant, called 'Fear':
The jeering, gloating ring of youths
Closed in around a solitary boy,
Teasing and taunting him
Because he was black.
The boy staggered from a blow;I wanted to help him
The yells grew louder,
Humiliating and bewildering the boy.
The colour of his skin was a cause
But fear sealed my mouth,
Held me back.
And soon I was yelling with the rest.