Tam Tak-chi took a leading supporting role in the Occupy Central with Love and Peace movement initiated by legal scholar Benny Tai.

In the 2015 District Council election, he ran against incumbent legislator Wong Kwok-hing of FTU in Siu Sai Wan but lost by a wide margin.

[8][9] In the 2019 District Council election, he ran against incumbent legislator Wilson Or of the Democratic Alliance for the Betterment and Progress of Hong Kong (DAB) in Kwong Tak but lost only by a narrow margin of 187 votes.

[10] On 24 May 2020, Tam was arrested opposite Sogo Hong Kong in Causeway Bay for participating in illegal assembly to protest against the national security law.

[12] On 17 July 2020, Tam was again arrested, this time on charges of incitement to participate in unlawful assembly in relation to a protest in January, seditious intention, and disorder in public places.

[13] His subsequent trial was delayed due to a High Court ruling in another case, which determined that the foregoing slogan carried secessionist notions.

Senior Superintendent Li Kwai-wah said that in speeches made across Hong Kong in the preceding summer months, Tam had been "inciting hatred and contempt against the government".