On March 16 President Truman signed legislation to eliminate the ten-cents-a-pound federal tax on yellow margarine, putting the synthetic spread on an equal footing with butter for the first time in sixty-four years. The repeal ended one of the nation’s most glaring examples of a fair trade regulation degenerating into simple protectionism. The controversy dated back to the 1870s, when margarine was introduced in America. At that time it had an unsavory reputation because of its manufacturing method, which was fairly innocuous by the standards of meatpacking plants but sounded unwholesome in more delicate surroundings.