6. c. 6) is an act of the Parliament of the United Kingdom passed to control extremist political movements in the 1930s such as the British Union of Fascists (BUF).

(The first conviction under the Act was of police officer and fascist-sympathizer William Henry Wood, by Leeds Magistrates' Court on 27 January 1937.

The party's forced abandonment of paramilitary and armed tactics improved their relations with the police and, by making it more "respectable", increased the BUF appeal among traditionally conservative middle-class citizens, who became the party's main base in the years after the Public Order Act 1936 was passed.

In November 1974, 12 people were each fined the maximum £50 under the Act for wearing black berets at Speakers' Corner during a Sinn Féin anti-internment rally.

[12] Annebella Pollen, The Public Order Act: Defining Political Uniform in 1930s Britain (Bloomsbury Academic, 2019) https://research.brighton.ac.uk/en/publications/the-public-order-act-defining-political-uniform-in-1930s-britain