Leaflets have been distributed to homes across Borehamwood which police are recording as "hate incidents".
Police say the leaflets have a focus on banning Kosher and Halal slaughter and are said to have been distributed by what has been described as a "far-right white nationalist group".
Jewish and Muslim communities have permission under UK law to slaughter animals without a mechanical stun, in accordance with their religious beliefs.
A number of residents have received a leaflet through their door in a town that has one of the biggest Jewish communities in the UK.
A Hertfordshire Constabulary spokesperson said: "We are aware that a number of local residents in Borehamwood have received leaflets through their doors which have caused distress and offence.
"While no crimes have been committed, this has been recorded as a hate incident and we would like to reassure you that we take such matters very seriously. As a result you will be seeing additional police patrols in the area.
"We know that hate incidents can have a severe impact on those involved, along with the wider community, and our hate crime officers can offer support to those affected by hate incidents.
"If you would like to speak to a hate crime officer, simply call 101 and ask to leave a message. A hate crime officer will then be in touch to talk to you."
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