The Syndicate is a large organization. They are not like the World Government and the Republic but their influence reaches all over the world.
And the Syndicate is actually divided into two.
The Golden Syndicate is like a merchant association with their importance policy directed into gaining power and money.
They have many safe houses over the world, catered to villains and even people who are running away from their factions or regime.
It is not only villains and evil people that used their service. Refugees and victims of persecution also uses their service.
The Dark Syndicate on the other hand is many things. They could spy for you, arrange assassinations, and even infiltrate a regime and even offer military support in many people who have enough leverage to hire them.
These two division did not interfere with each other but the Syndicate is ruled by one mysterious person.