I shall read some excerpts from the official announcement of the British Broadcasting Corp. of the approaching showing of the film: Tonights program is about these men. women and childrenPreviously it had mentioned the "3 million" Americans who are "migratory farmworkers." Tonights program is about these men. women and children. and the way they live and move around in search of work. Mr. James P. Mitchell. who was President Eisenhowers Secretary of Labor. calls them "the excluded Americans." One of them. a 29yearold Negress. a migrant worker since she was 8. now the mother of 14 children. describes how she earns $1 per 10hour day of picking beans. There are scenes in this film reminiscent of "The Grapes of Wrath." It pulls no punches. One farmer is quoted as saying: "We used to own our slaves. now we just rent them." Mr.