San Francisco International Airport officials have been citing and arresting drivers from app-enabled rideshare companies that pick up and drop off passengers, an airport spokesman said.
Airport spokesman Doug Yakel said there have been seven citizen's arrests issued to "various offenders" since July 10.
The airport had issued cease-and-desist letters to companies such as Lyft, Sidecar and Uber in April.
Since then, Yakel said airport officials, in conjunction with airport police, had been "admonishing" drivers that came to the airport.
Yakel said the companies are not permitted to offer their services at SFO and they are now being cited for unlawful trespassing.
The California Public Utilities Commission, which regulates and licenses passenger carriers, has been looking into how to regulate rideshare companies.
An evaluation of ride services will come to the commission sometime this week after being mulled since the beginning of the year, CPUC spokesman Chris Chow said.
Meanwhile, taxi drivers held a rally at City Hall on Tuesday to "keep taxis regulated and safe," calling for an end to the ride services.
Members from the San Francisco Cab Drivers Association and United Taxicab Workers of San Francisco demanded that city officials and regulatory agencies consider the companies illegal taxi services.
Protesters said the drivers are exempt from regulation, vehicle inspections, and insurance and driver requirements.
Dean Clark, a former taxi driver for nearly a decade, said authorities should not be targeting the drivers but rather the rideshare companies. He said the drivers are simply offering rides to people for a donation, and that unlike what the taxi industry claims, many of the drivers are working students, partially retired people and single parents.
Clark said the SFO pickup area is a taxi domain because there is a pickup fee, and ride-service drivers know and respect that.