Columbia subject headings:
Communists--Italy--Biography.
Grieco, Ruggero.
Partito comunista italiano--History.
Harvard subject headings:
Communists--Italy--Biography
Grieco, Ruggero.
Partito comunista italiano--History.
Princeton subject headings:
Communists--Italy--Biography.
Grieco, Ruggero.
Partito comunista italiano--History.