"Dragon's Teeth" is the most celebrated novel of this Upton Sinclair series, as it won the "Pulitzer Prize for the Novel" in 1943. This book covers 1929-1934, with a special emphasis on the Nazi takeover of Germany in the 1930s. The Night of the Long Knives (German: Nacht der langen Messer (help•info)) or "Operation Hummingbird", or, more commonly used in Germany "Röhm-Putsch" was a purge that took place in Nazi Germany between June 30 and July 2, 1934, when the Nazi regime carried out a series of political executions. Most of those killed were members of the Sturmabteilung (SA), the paramilitary Brownshirts. Adolf Hitler moved against the SA and its leader, Ernst Röhm, because he saw the independence of the SA and the penchant of its members for street violence as a direct threat to his power.