As video spread of an officer in riot gear blasting pepper spray into the faces of seated protesters at a northern California university, outrage came quickly -- followed almost as quickly by defense from police and calls for the chancellor's resignation. In the video, an officer dispassionately pepper-sprays a line of several sitting protesters who flinch and cover their faces but remain passive with their arms interlocked as onlookers shriek and scream out for the officer to stop. As the images were circulated widely on YouTube, Facebook and Twitter on Saturday, the university's faculty association called on [UC Davis Chancellor Linda] Katehi to resign, saying in a letter there had been a gross failure of leadership." The protest was held in support of the overall Occupy Wall Street movement and in solidarity with protesters at the University of California, Berkeley. Images of police actions have served to galvanize support during the Occupy Wall Street movement, from the clash between protesters and police in Oakland last month that left an Iraq War veteran with serious injuries to more recent skirmishes in New York City, San Diego, Denver and Portland, Ore. Some of the most notorious instances went viral online, including the use of pepper spray on an 84-year-old activist in Seattle and a group of women in New York.