Far-right racist Tommy Robinson, who led a march in London on 8 December, is receiving financial support from US right-wing thinktanks and others including the David Horowitz Freedom Centre (DHFC).
The DHFC is well-funded by influential right-wing donors, according to tax returns scrutinised in an investigation by the Guardian.
In 2014-16, the returns showed they received a total of almost $5 million from several millionaire donors.