TWG predecessors and rivals
Habicht - Axworthy, 1947
World Federalist Movement: http://www.wfm-igp.org/
Committee for a Democratic UN (2003-): http://www.kdun.org/
Campaign for a United Nations Parliamentary Assembly (2007-): http://en.unpacampaign.org/
Davis, 1953
World Government of World Citizens: http://www.worldgovernment.org/
Isely - Martin, 1958
World Constitution and Parliament Association (1958-): http://www.radford.edu/gmartin/WCPA%20page.htm
Earth Federation Movement: http://earthfederation.info/
World Constitutional Convention / World Constituent Assembly (1968, 1972, 1979, 1991)
The Constitution for the Federation of Earth: http://www.radford.edu/gmartin/CEF.pdf
Provisional World Parliament (13 sessions, 1982-2012; 14th scheduled Dec.2015): http://worldparliament-gov.org/
List of World Legislative Acts: http://www.radford.edu/gmartin/PWP.legis.acts.list.htm
Stark - Stalets, 2004
Vote World Parliament: http://voteworldparliament.org/