The Nobel Prize-winning German author Günter Grass has been barred from visiting Israel after the publication last week of a poem titled “What Must Be Said.” In the poem, Grass described the nuclear-armed state of Israel as a threat to world peace. The poem also assailed Israel for its threats to attack Iran, called for supervision of Israel’s nuclear weapons, and criticized Germany for selling submarines to Israel. Grass is considered to be Germany’s most famous living writer. He won the Nobel Prize in Literature in 1999.