The phrase "whole gang" refers to a group or collection of people who are closely associated with each other and often spend time together. Full definition
The soup also contain the other Thai classics; garlic, kaffir lime leaves, lemongrass, fish sauce, coconut cream, etc, you know, who whole gang is here. (avocadopesto.com)
He's using his new powers to slice and dice much bigger opponents, taking out whole gangs of bad guys at a time, still getting his jobs through the divey hitmen - only bar called Sister Margaret's. (hollywoodreporter.com)
Remember the episode of The Office when the whole gang had to undergo sensitivity training because of one tone - deaf joke from Michael Scott? (canadianbusiness.com)