Final answer:
New York OC bosses are linked by an informal arrangement akin to Tammany Hall practices, where power was maintained through graft, bribery, and required kickbacks.
Step-by-step explanation:
According to the text, New York OC bosses are linked in a rather informal arrangement known as a system that can often be seen as analogous to the historical practices of Tammany Hall's leadership. These organizational practices involved graft, bribery, rigged elections, and the necessity of paying kickbacks to stay in business during the times of "Boss" Tweed. Over time, organized crime figures in New York established a network that shares similarities with these historical practices, operating through various forms of informal agreements and understandings rather than through formal institutions.