A statement from the Occupy London camp said: "The reference to 'suspected activists' seems to demonstrate a disturbing loss of perspective.
"Activism is not a crime and the desire to participate in democratic decision-making should not be a cause for concern for the police in any free society.
"An institution that confuses active citizens with criminals and equates al-Qaida with efforts to re-imagine the City is an institution in grave danger of losing its way."
Asked about the document, the City of London police said their community policing methods had been praised.
A spokesman added: "City of London police works with the community to deter and detect terrorist activity and crime in the City in a way that has been identified nationally as good practice.
"We've seen crime linked to protests in recent weeks, notably around groups entering office buildings, and with that in mind we continue to brief key trusted partners on activity linked to protests."