The union representing airport workers issued a statement against United Airlines for having a passenger forcibly removed from one of its flights.

In its statement issued Monday, the Service Employees International Union said its members were holding United accountable for its actions.

Video posted to social media on Sunday showed a man being dragged off a United plane in Chicago by security after the airline said it overbooked the flight.

"Airport service workers in SEIU are appalled by United Airlines' treatment of a passenger who was forcibly removed from a flight that United overbooked," the SEIU statement said.

"As baggage handlers, ramp workers, wheelchair attendants, and cabin cleaners, we work hard every day to make the passenger experience as pleasant as possible."

United CEO Oscar Munoz released a statement about the incident, and apologized for "re-accommodating" the passengers.

United CEO response to United Express Flight 3411. pic.twitter.com/rF5gNIvVd0 — United Airlines (@united) April 10, 2017

The SEIU accused the airline of using the practice of overbooking to "maximize ever-increasing profits."

The union represents about 2 million workers, including about 375,000 who work in public facilities like airports.

NJ Advance Media reached out to United to respond to the union's statement, but did not immediately hear back.

Rajeev Dhir may be reached at rdhir@njadvancemedia.com. Follow him on Twitter @googasmammoo. Find NJ.com on Facebook.