Vanguard Group soon will file a registration statement with the SEC for a new passively managed, socially responsible mutual fund the Vanguard Calvert Social Index fund. John Brennan, Vanguard chairman, said customers have been asking for a socially responsible mutual fund for more than 10 years, but that a suitable index hadnt been available. Vanguards partner in the offering is Calvert Group, which is developing the Calvert social index. The new index will screen the 1,000 largest U.S. companies on five criteria: environment; workplace issues; product safety and impact; international operations; and human rights. The index will exclude companies involved with production and sale of tobacco, alcohol, gambling or nuclear power and companies that violate fair labor practices and equal opportunity standards.