Humane Labs is a compound located on Chianski Passage, in San Chianski Mountain Range, Blaine County. The compound allows you to perform a heist and release a caged animal used for experiments inside the facility. This location is displayed on the map with a brown-colored H sign icon: 
To begin the heist, head to the checkpoint located at the entrance of the facility and type /robbery to begin. Once you have started, kill the guards as you go through the facility and find the monkey.
Once you have found the monkey, press Pickup key (default E) to whistle, so the monkey starts following you.
Escape the compound and deliver the monkey to Cayo Perico Wilderness to free it.
After you've reached your destination, the monkey will be set free and heist will be complete.
Arriving at the hideout without cops near you will decrease your wanted level.