There aren't many American LCN guys of Northern Italian origins for several reasons:

1. Northern Italy had/has a much stronger economy than the South.

2. Northern Italians traditionally settled in California during the mass Italian immigration period to the United States, they generally did not settle in LCN hot beds like NY/NJ/Philly.

3. Northern Italians were discriminated against when they arrived in the United States obviously. However, I strongly suspect that they didn't face nearly as much discrimination as their southern Italian counterparts due to the fact that they had features like blonde hair, blue eyes, red hair, lighter skin, etc. ALL CATHOLICS were discriminated against though, look at the Irish.