Who's-Who Pirates

The Who's-Who Pirates were a pirate crew that was once captained by Who's-Who before he joined the Beasts Pirates.

Crew Strength
Given that the crew was led by someone who was once a member of CP9 and then became one of the top officers of the incredibly powerful Beasts Pirates, it's safe to assume that the crew in its entirety was quite strong in its own right.

History
In the past, the crew was founded by Who's-Who after he escaped from prison, but at some point, he was recruited by Kaidou to join the Beasts Pirates. It's unknown what happened to the rest of his crew afterwards.