Updated 8:07 AM ET, Fri October 16, 2015
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Supporters of Donald Trump before he announced his bid for the presidency at the Trump Tower on June 16, 2015. It later emerged that actors were hired to cheer the announcement. KENA BETANCUR/AFP/AFP/Getty Images
The start-up 'Crowds on Demand' supplies actors for almost any type of public event, including for grassroots activism campaigns. In most cases this never comes to light, even to protest organizers. Scott Olson/Getty Images North America/Getty Images
The business began by supplying guests, bodyguards and paparazzi to celebrity parties to raise their profile. Marc Piscotty/Getty Images North America
The service is also popular for PR stunts and product launches. Ben A. Pruchnie/Getty Images Europe/Getty Images
'Easy crowd' offers a similar service in Ukraine, inspired by the 'Orange Revolution,' and the business model is spreading. YURI KADOBNOV/AFP/AFP/Getty Images