People are not just internal or external. LOC is a scale and individuals vary in their position on it. So, high internal LOC is at one end of the continuum and high external at the other. Low in and low ext lie in-between.
Resistance to social influence
People with high internal LOC are more able to resist pressures to conform or obey
Internals tend to base their decisions on their own balefires rather than depending on the opinions of others
People with high internal LOCs tend to be more self-confident, achievement-orientated and have higher intelligence - these traits lead to greater resistance to social influence