This is a Wall Street Journal article on it and they said immigrants commit fewer crimes than natives:
http://www.wsj.com/articles/the-mythical-connection-between-immigrants-and-crime-1436916798
Here is what I learned in my economics classes on illegal immigration:
1. It doesn’t steal jobs. There aren’t a fixed number of jobs in an economy. (Source)
2. It actually creates MORE jobs because the workers take their wages and spend it on rent, cell phones, food, etc which creates more jobs for other people. (Source)
3. It grows the economy because more money is beingspent and demands more goods. (Source)
