The trustee liquidating MF Global has sold a collection of the bankrupt broker's CME Group memberships for amounts below recent selling prices, Reuters reported yesterday. Eighteen months after MF Global collapsed, Trustee James Giddens last week sold a variety of memberships owned by the firm that bestow different trading rights on the holders. The firm, which was among the top brokers at CME Group's exchanges, made a $6.3 billion bet on European sovereign debt and went bankrupt after dipping into customer accounts to try to meet margin calls, in violation of industry rules.