The Farm Labor Organizing Committee signs the first American guest worker union contract: The North Carolina Growers Association, which represents 1,000 farmers, signed a union contract yesterday covering 8,500 guest workers from Mexico - a move that the association and union said was the first union contract in the nation for guest workers. At the signing ceremony at a church in Raleigh, the Mount Olive Pickle Company, the nation's second largest pickle company, announced that it had signed a separate contract with the union, the Farm Labor Organizing Committee, ending a five-and-a-half-year boycott campaign against the company. The two contracts end a long, bitter dispute in which the Farm Labor Organizing Committee accused Mount Olive of using cucumber growers who mistreated their workers. In organizing a boycott that was backed by the National Council of Churches, the union said that workers employed by Mount Olive's growers often lived in squalid housing and that one worker had died of heat prostration and another of heat prostration or exposure to pesticides. "The company is tremendously relieved to have the boycott ended,'' said Baldemar Velasquez, president of the Farm Labor Organizing Committee, which is based in Toledo, Ohio. "They were getting tired of all the negative publicity." Bill Bryan, Mount Olive's president, said the boycott hardly hurt the company's sales, except in pockets of the Midwest. But he acknowledged it was time-consuming and annoying to have to respond to questions about why his company was being boycotted.