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[...] he has the highest recorded number (505) of confirmed sniper kills in any major war.

The unofficial Finnish front line figure from the battlefield of Kollaa places the number of Häyhä's sniper kills at over 800.

Besides his sniper kills, Häyhä was also credited with over two hundred kills with a Suomi KP/-31 submachine gun, thus bringing his credited kills to at least 705.

Simo Häyhä spent his last years in Ruokolahti, a small village located in southeastern Finland, near the Russian border.

Child-murderer and rapist, convicted of killing 110 young girls but confessed to killing 300, exact total unknown. Known as "The Monster of the Andes" and sentenced in 1983 but released in 1998, believed to still be killing.

Hand-picked for the position by Joseph Stalin in 1926, Blokhin led a company of executioners that performed the majority of executions carried out during Stalin's reign (most during the Great Purge). The Soviet government put the number of NKVD official executions at 828,000 during Stalin's reign,[2] and Blokhin is recorded as having personally executed tens of thousands of prisoners by his own hand over a 28-day period—including 7,000 condemned Polish POWs in one protracted mass execution[2][3]—making him the most prolific official executioner in recorded world history.[2][4] He was awarded both the Order of the Badge of Honor (1937) and the Order of the Red Banner (1941).[5]