Activists protest near the Manhattan apartment of billionaire and Republican financier David Koch last June in New York City. The demonstrators were protesting against the campaign contributions by the billionaire Koch brothers. Photograph: Spencer Platt/Getty Images

With just 646 days to go, the 2016 US presidential race is already starting up and the ring is packed with various Republicans vying to prove who is t(...)

 Charles Koch and his brother David, have been at the centre of political controversy in recent years for using their power to back Republican candidates.   Photograph:  John Chiasson/Liaison

One of the largest privately-owned businesses in the US, Koch Industries, is among the multinationals whose dealings are covered in the latest batch (...)

EU competition commissioner Margrethe Vestager: “We consider the Luxembourg leaks as market information. We will examine it and evaluate whether or not this will lead us to opening new cases.” Photographer: Freya Ingrid Morales/Bloomberg

A new leak of confidential documents expands the list of big companies seeking secret tax deals in Luxembourg, exposing tax-saving manoeuvers by Ameri(...)

Donating millions of dollars to the election campaign coffers of Republican candidates, the Koch brothers attempt to influence policy in the direction of their agenda to lower taxes and limit the role of government. Photograph: Gordon M. Grant/The New York Times

In Wichita, Kansas, locals are reluctant to speak about Charles and David Koch, the conservative billionaire industrialists whom Republicans count (...)

Too close for comfort: Kay Hagan’s opponents have used her kiss from Barack Obama last week against her. Photograph: Saul Loeb/AFP/Getty
Obama: kiss of death?

High on a shelf above a counter in the Raleigh Times Bar is an empty pint glass, sitting encased in front of a US presidential seal. This is the glass(...)

Tom Steyer, center, a billionaire environmental activist who wants to blast the issue of climate change to the front lines of American politics, at the NextGen Climate Action office in San Francisco. Photograph:Jason Henry/The New York Times

Billionaire environmental activist Tom Steyer will give a boost to 2014 political candidates from seven US states who work to combat climate change, c(...)

Three of the world’s richest men, according to Forbes magazine’s annual list of billionaires worldwide: Warren Buffett, Carlos Slim and Bill Gates.

Forbes magazine published a special edition in March with the cover headline: “Bi(...)