General Workers:
* Crew - a group of workers, especially on a ship or aircraft
* Staff - a group of people employed by an organization
* Workforce - all the people employed by a particular company or organization
* Team - a group of people who work together
* Gang - a group of workers, often used for a specific task
* Work party - a group of people working together on a project
* Company - a group of people who work together, especially in a business
Specific Workers:
* Band - a group of musicians
* Choir - a group of singers
* Ensemble - a group of actors, dancers, or musicians
* Faculty - a group of teachers at a university or college
* Posse - a group of people, especially a group of workers in a specific field
* Squad - a small group of workers, often working on a specific project
Informal:
* Bunch - a group of people, used casually
* Crowd - a large group of people, often used for workers in a specific area
* Pack - a group of people, used casually
The best collective noun to use depends on the specific situation and the type of work being done.