From the obituary link above:
“Günter Grass, who has died aged 87, was Germany’s best-known postwar novelist, a man of titanic energy and zest who, besides his fiction-writing, enjoyed the cut and thrust of political debate and relaxed by drawing, painting and making sculptures. Bursting on to the literary scene with his bestselling novel The Tin Drum in 1959, Grass spent his life reminding his compatriots of the darkest time in their history, the crimes of the Nazi period, as well as challenging them on the triumphalism of unification in 1990, which he described as the annexation of East Germany by West Germany in which many citizens became victims.
He was always controversial, and sometimes bitterly attacked by critics at home for discussing German victimhood as well as German guilt. Outside his country he was, inevitably, called Germany’s postwar conscience, a label he shared with the older writer Heinrich Böll. In 1999, much later than expected, he won the Nobel prize for literature. The Scandinavian judges praised his “creative irreverence” and “cheerful destructiveness”.”