Blade Runner (1982)
Early in the 21st Century, THE TYRELL CORPORATION advanced Robot evolution into the NEXUS phase - a being virtually identical to a human - known as a Replicant.
The NEXUS 6 Replicants were superior in strength and agility, and at least equal in intelligence, to the genetic engineers who created them.
Replicants were used Off-world as slave labor, in the hazardous exploration and colonization of other planets.
After a bloody mutiny by a NEXUS 6 combat team in an Off-world colony, Replicants were declared illegal on earth - under penalty of death.
Special police squads - BLADE RUNNER UNITS - had orders to shoot to kill, upon detection, any trespassing Replicant.
This was not called execution.
It was called retirement.
Blade Runner 2049 (2017)
REPLICANTS ARE BIOENGINEERED HUMANS, DESIGNED BY TYRELL CORPORATION
FOR USE OFF-WORLD. THEIR ENHANCED STRENGTH MADE THEM IDEAL FOR SLAVE LABOR
AFTER A SERIES OF VIOLENT REBELLIONS, THEIR MANUFACTURE BECAME
PROHIBITED AND TYRELL CORP WENT BANKRUPT
THE COLLAPSE OF ECOSYSTEMS IN THE MID 2020s LED TO THE RISE OF INDUSTRIALIST
NIANDER WALLACE, WHOSE MASTERY OF SYNTHETIC FARMING AVERTED FAMINE
WALLACE ACQUIRED THE REMAINS OF TYRELL CORP AND CREATED A NEW
LINE OF REPLICANTS WHO OBEY
MANY OLDER MODEL REPLICANTS -- NEXUS 8s WITH OPEN-ENDED LIFESPANS -- SURVIVED.
THEY ARE HUNTED DOWN AND 'RETIRED'
THOSE THAT HUNT THEM STILL GO BY THE NAME ...