Question: What type of group does Working for a Nuclear Free City and World Party have in common?

Context paragraphs:
World Party: World Party is a British alternative rock band, which is essentially the solo project of its sole member, Karl Wallinger.  He started the band in 1986 in London after leaving The Waterboys.

Working for a Nuclear Free City (album): Working For A Nuclear Free City is the debut album by Manchester (United Kingdom) indie band Working for a Nuclear Free City.  The album was not released in the United States but all its tracks were included on their next release, the double album "Businessmen & Ghosts".  Their song "Dead Fingers Talking" was used in the first episode of the show Breaking Bad

Treaty of Rarotonga: The Treaty of Rarotonga is the common name for the South Pacific Nuclear Free Zone Treaty, which formalises a Nuclear-Weapon-Free Zone in the South Pacific.  The treaty bans the use, testing, and possession of nuclear weapons within the borders of the zone.

Working for a Nuclear Free City: Working for a Nuclear Free City (sometimes abbreviated to WFANFC) was an indie nu gaze band from Manchester, England.

Bang! (World Party album): Bang!  is the third album by British group World Party, released by Ensign Records on April 26, 1993.  While previous World Party albums were essentially solo projects by one-man orchestra Karl Wallinger, for this album World Party officially became a three-person group: Wallinger (vocals, keyboards, guitars, basses, etc.), Dave Catlin-Birch (guitars), and Chris Sharrock (drums).  As well, the band is aided by a number of guest artists.

Communist Party (Free City of Danzig): The Communist Party in Danzig (present-day Gdańsk) was initially founded as a subdivision of the East Prussian section ("bezirk") of the KPD.  In 1921 a separate party branch of the KPD in the Free City of Danzig was set up.  While the Party did not run in the first elections of 1920, twelve members of the USPD in the Volkstag joined the Communist Party on 28 January 1921 (seven of them joining the Social Democratic Party of the Free City of Danzig in June 1923).  In the following elections the Party ran with varying success.

Philip Kay: Philip Kay is a contemporary composer and producer.  He is also a founding member of the band Working For A Nuclear Free City.

Businessmen &amp; Ghosts: Businessmen & Ghosts is a double album by British band Working for a Nuclear Free City.  The album is Working for a Nuclear Free City's U.S. debut album.

Fri (yacht): Fri, a New Zealand yacht, led a flotilla of yachts in an international protest against atmospheric nuclear tests at Moruroa in French Polynesia in 1973.  "Fri" was an important part of a series of anti-nuclear protest campaigns out of New Zealand which lasted thirty years, from which New Zealand declared itself a nuclear-free zone which was enshrined in legislation in what became the New Zealand Nuclear Free Zone, Disarmament, and Arms Control Act 1987.  In 1974, coordinated by Greenpeace New Zealand, the "Fri" embarked on a 3-year epic 40,233 kilometers “Pacific Peace Odyssey” voyage, carrying the peace message to all nuclear states around the world.

Jojo Burger Tempest: Jojo Burger Tempest is a double album by the British band Working for a Nuclear Free City.  Released in 2010, the album is the band's third album, and the second to be released in the U.S.  The album contains one disc of 17 individual songs and one of a single 33-minute suite.

Supporting paragraphs: Working for a Nuclear Free City World Party
Answer: band