1953), more commonly referred to as the Investment Bankers Case was a multi-year antitrust case brought by the United States Justice Department against seventeen of the most prominent Wall Street investment banking firms, known as the Wall Street Seventeen.

The Justice Department filed suit against the firms in 1947, claiming that the leading investment banking firms had combined, conspired and agreed, in violation of the Sherman Antitrust Act, to control and monopolize the U.S. Securities markets.

The case, which was brought to trial in the Southern District of New York in 1952, was presided over by the controversial and politically conservative Federal judge Harold Medina, who had become internationally infamous for his rulings in the 1949 Smith Act trials of Communist Party leaders.

[6] In October 1953, after a year-long trial, Medina found in favor of the investment banking firms.

In his judgment, he saw "a constantly changing panorama of competition among the seventeen defendant firms."