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Ranks

There are groupings of assassins and ranks within. The highest rank seems to be Master, and there may be one per city (nc 2,54), although there might just be one in the entire caste of Gor (nc13). There is at least a group as big as 22 assassins, with the rank of Captain and Lieutenant (nc64,69 ).

(notecard 2 of Garians original SL Gor document)
"More effective than the Assassins of Ar," she said. "Pa-Kur, Ar’s Master Assassin, was dispatched to kill you, but failed."
Tarnsman of Gor, Chapter 8
 
(notecard 54 of Garians original SL Gor document)
The training of the assassin is thorough and cruel. He who wears the black of that caste has not won it easily. Candidates for the caste are chosen with great care, and only one in ten, it is said, completes the course of instruction to the satisfaction of the caste masters. It is assumed that failed candidates are slain, if not in the training, for secrets they may have learned. Withdrawal from the caste is not permitted. Training proceeds in pairs, each pair against others. Friendship is encouraged. Then, in the final training, each member of the pair must hunt the other. When one has killed one’s friend one is then likely to better understand the meaning of the black. When one has killed one’s friend one is then unlikely to find mercy in his heart for another. One is then alone, with gold and steel.
Beasts of Gor, Chapter 30
 
(notecard 54 of Garians original SL Gor document)
The training of the assassin is thorough and cruel. He who wears the black of that caste has not won it easily. Candidates for the caste are chosen with great care, and only one in ten, it is said, completes the course of instruction to the satisfaction of the caste masters. It is assumed that failed candidates are slain, if not in the training, for secrets they may have learned. Withdrawal from the caste is not permitted. Training proceeds in pairs, each pair against others. Friendship is encouraged. Then, in the final training, each member of the pair must hunt the other. When one has killed one’s friend one is then likely to better understand the meaning of the black. When one has killed one’s friend one is then unlikely to find mercy in his heart for another. One is then alone, with gold and steel.
Beasts of Gor, Chapter 30
 
(notecard 13 of Garians original SL Gor document)
And when the swift living blade of Sarm was still a full yard from my throat it met the lightning steel of a Gorean blade that had once been carried at the siege of Ar, that had met and withstood and conquered the steel of Pa-Kur, Gor's Master Assassin, until that time said to be the most skilled swordsman on the planet.
Priest-Kings of Gor, Chapter 27
 
(notecard 64 of Garians original SL Gor document)
"We can kill every male prisoner in the depths," said one of the fellows in black, a lieutenant.
"You have no authorization for that," said the pit master.
"You know whom we seek," said the leader of the men in
black tunics. There were twenty-three in their party, the leader, a lieutenant, the fellow called 'Gito', and twenty men. Each of the twenty men carried a sword, a dagger, and a crossbow. Some had their bows set.
Witness of Gor, Chapter 31
 
(notecard 69 of Garians original SL Gor document)
"But Captain," said the lieutenant. "Should we not call Gito?"
Witness of Gor, Chapter 31
 
(notecard 6 of Garians original SL Gor document)
I dyed my hair black and acquired the helmet and gear of an Assassin. Across the left temple of the black helmet I fixed the golden sash of the messenger.
Tarnsman of Gor, Chapter 16
 
(notecard 9 of Garians original SL Gor document)
I had expected to be fired on immediately but suddenly remembered that I still wore the garb of the messenger. No Assassin would fire on me, and no one else would dare.
Tarnsman of Gor, Chapter 19

There are also special roles within the black caste such as messengers that have a fixed golden sash to indicate this (nc6). They are safe from conflict (nc9).

There is no elder assassin.