Hellman was born on June 20, 1905 to a middle class Jewish family. She was an only child and attended New York University. She worked for Boni and Liveright publishers until her marriage to theatrical agent Arthur Kober. She had a long affair with Dashiell Hammett, the mystery writer. Hellman was blacklisted in Hollywood for being a Communist and called to testify before the House Un-American Activities Committee. She recovered financially from this and died wealthy on June 3, 1984.