Police blocked several dozen haredi protestors who were trying to make their way to the Intel plant in Jerusalem's Har Hotzvim industrial area on Saturday.
The capital's ultra-Orthodox community is protesting the plant's operation on Shabbat.
Some 50 haredim who demonstrated near a police roadblock that was set up along a road leading to the plant shouted "Shabbes" and called the officers "Nazis" and "Zionists, you caused the Holocaust."
No violent incidents were reported at the scene.
Despite a decision by haredi leaders in the capital to hold protests against Intel only on weekdays, some 40 ultra-Orthodox residing in nearby neighborhoods gathered outside the plant Friday night and held an impromptu rally at the site.
Police rushed to the scene, but no violent incidents were reported.
The protests outside the Intel plant began two weeks ago. During last week's rally, which was attended by hundreds of haredim, a number of protestors attacked the driver and passengers of a vehicle traveling on a road near the plant. No injuries were reported in the incident.
Intel and the Jerusalem Musicality claim that the plant has been operating on Shabbat for the past 24 years and that its activity does not constitute a violation of the status quo.