Tycoon Dave Whelan has donated £1m to the Conservative Party because he is angry the government has "failed" to adequately deal with law and order.
Dave Whelan expanded JJB Sports into a nationwide chain
Mr Whelan is the chairman of Wigan Athletic football club and the former owner of the JJB Sports chain.
He described Tory leader David Cameron as having his "full support".
"David's promise to deal with knife and gun crime, early release of prisoners and more prison places is music to my ears," Mr Whelan said.
He stressed he had been particularly affected by the fatal shooting of a boy of 11 in Liverpool last month.
"The murder of Rhys Jones upset me and my family, just as it did so many people in this country," he said.
Mr Cameron had "the right approach" to law and order, Mr Whelan said, adding the Conservatives were the only party "prepared to take on" this area.
Mr Whelan is not believed to have donated money to a political party before.