A group of former MF Global customers on Monday asked a court for permission to subpoena the commodities broker's executives, including former CEO Jon Corzine, who was blamed in a congressional report this month for MF Global's collapse, Reuters reported yesterday. The Commodity Customer Coalition, an advocate for trader customers who lost money when MF Global went under, is seeking to subpoena Corzine, Chief Financial Officer Henri Steenkamp, Chief Operating Officer Bradley Abelow and others, according to court papers filed yesterday. While Corzine has stepped down, some executives remain at the company, assisting in its wind-down. Abelow, the highest-ranking executive still at the firm, just last week gave his notice and is leaving at the end of the week.