The two brothers were selected as part of an eight-person delegation to represent the English Midlands at a "general convention of the industrial classes" in London, which was to present the People's Charter to parliament.

[7] In March 1837 Muntz organised a meeting to decide on whether Birmingham should apply for a charter of incorporation under the Municipal Corporations Act 1835.

In 1839 riots broke out in the Bull Ring, leading to the government taking over policing in Birmingham and creating a force under the control of the Home Office.

The position of the Radicals on the council was undermined by the militant followers of Feargus O'Connor who advocated resisting the "government police" by armed means.

Muntz was appointed the chairman of the committee formed to ensure the re-election of the two Liberal MPs, John Bright and William Scholefield, for the two-seat constituency.

The change came into effect at the next general election in 1868, at a meeting of the Birmingham Liberal Association Muntz was chosen to contest the seat along with the two sitting MPs Bright and George Dixon (who had replaced Scholefield in 1857).

Mr Muntz, as a manufacturer himself, will represent the industrial interest of the town, which is assuredly of sufficient importance to deserve a guardian in the new Parliament".

[23] The resolution was passed unanimously by the town council "for the invaluable privileges he had conferred upon this community through his and others' exertions, and in recognition of his subsequent services in the discharge of the duties of councillor, alderman, mayor, justice of the peace and representative of the borough of Birmingham in Parliament".