 Receiving much support from labor and leftist groups, he was monitored by the Federal Bureau of Investigation (FBI).In the early 1970s, Chavez sought to expand the UFW's influence outside California by opening branches in other U.S. states.Viewing illegal immigrants as a major source of strike-breakers, he also pushed a campaign against illegal immigration into the U.S., which generated violence along the U.S.-Mexico border and caused schisms with many of the UFW's allies.