About 30 members of the Detroit-based National Socialist Movement gathered at Pomona City Hall to express their opposition to illegal immigration and California's Dream Act, which allows undocumented students to access financial aid.
There were tense moments as several dozen counter-protesters shouted and jeered at the neo-Nazis from the opposite side of a police and Los Angeles County sheriff's deputy line that was dividing the groups.
Some of the counter-protesters threw cones and other items at the neo-Nazis.
The neo-Nazis said they chose Pomona because the city is a sanctuary for illegal immigrants.
The Associated Press contributed to this report.