Definition of riggers:
(n) :
One whose occupation is to fit the rigging of a ship or of a counterweight system.
(n) :
One whose occupation is to lift and move large and heavy objects (such as industrial machinery) with the help of cables, hoists, and other equipment.
(n) :
A worker on an oil rig.
(n) :
One who rigs or dresses; as:
(n) :
(animation) One whose occupation is to outfit a computer model with controls for animation.
(n) :
One who rigs or manipulates (an election, etc).