LIMA -- Efforts to stem illegal immigrants from neighboring countries are increasing in parts of Latin America because of concerns, similar to those in the United States, that they drive down salaries and bring crime and violence with them. Ecuador, Chile and Venezuela are discussing whether to restrict illegal migrants while Costa Rica recently tightened barriers. Peru is studying whether to tighten its southern border with Bolivia. Driving the changes are concerns echoed in the current U.S. immigration debate: that undocumented workers take jobs from locals, raise the crime rate and drain tax dollars through their use of public school...