SEIU 105 is one of the fastest-growing unions in Colorado, growing by over 50% over the last five years, representing over 8,000 healthcare, janitorial, security, and airport workers throughout the state and the southwest. Founded in 1939, we are united by the belief in the dignity and worth of workers and the services they provide and dedicated to improving the lives of workers and their families and creating a more just and humane society.