A faux film poster issued by the charity on Twitter depicts a raging sea under the tag line: "The perfect storm... starring zero hours contracts, high prices, benefits cuts, unemployment, childcare costs."
But Conservative backbencher Conor Burns slammed the "highly political campaign," saying people who support Oxfam will be left "shocked and saddened."
"Most of us operated under the illusion that Oxfam's focus was on the relief of poverty and famine overseas," he said.
"I cannot see how using funds donated to charity to campaign politically can be in accord with Oxfam's charitable status."
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