High Quality Content by WIKIPEDIA articles! Eliseo Vasquez Medina (born January 24, 1946) is a Mexican American labor union activist and leader, and advocate for immigration reform in the United States. From 1973 to 1978, he was a board member of the United Farm Workers. He is currently secretary-treasurer of the Service Employees International Union. He was previously an international vice president, the first Mexican American to serve on the union`s executive board.