A brawl broke out and one of the Klansmen was knocked to the ground and kicked, and whose arm Levin said he later saw bleeding.
Levin said he pushed the Klan leader away as the violence continued and a protester was stabbed.
Levin said he asked the man, "How do you feel that a Jewish guy just saved your life?"
"Thank you," the man replied, according to Levin.
A large crowd gathered at the park, with many demanding to know why Anaheim police did not have a larger presence at the scene before the violence broke out.
Levin was also critical of the lack of police presence prior to the melee.
"There were no police officers here when this started happening," Levin said.
The Klan has a long and troubling history with the city. Klansmen were once the dominant political force in Anaheim, holding four of five City Council seats before a recall effort led to their ouster in 1924.
At the height of the group's power in Orange County, nearly 300 Klansmen lived in Anaheim, patrolling city streets in robes and masks. A large KKK rally once attracted 20,000 people to the city.
KKK activity nationwide has decreased dramatically in recent decades, according to the Southern Poverty Law Center, which estimated the group has between 5,000 and 8,000 members across the country.
The group's activities have been sporadic in Southern California in recent years. Last summer, at least 100 residents of Whittier and Fullerton awoke to find packets containing KKK fliers, rife with racist rhetoric, and candy in their driveways. A Santa Ana neighborhood was also blanketed with KKK fliers on Martin Luther King Jr. Day last year, police said.
An 8-foot cross was burned outside the home of a black man in Anaheim Hills in 2003, and the FBI investigated the case as a hate crime, but police did not specifically link that case to the KKK.