Gunter Grass, the Nobel Prize laureate in literature who is barred from entering Israel because of his anti-Israel writings and membership in the Nazi Waffen SS, launched a second poetic attack on Israel by praising atomic spy Mordechai Vanunu.

In a new book of poems titled Eintagsfliegen, which was released on Saturday in Germany, Grass terms Vanunu, a former worker at the Dimona nuclear facility, a “hero” for his decision to transfer secret information to England’s Sunday Times in 1986. An Israeli court later convicted Vanunu of espionage and sentenced him to 18 years in prison.