Neither Bernie nor AOC is socialist in a meaningful sense. Bernie campained on taxing the rich and single payer healthcare which is radical in the American contest but it is not enough to make him a socialist. After he got ratfucked by DNC he has started toeing their line uncritically.
If you want a prominent western anglosphere politician who is socialist, look at Jeremy Corbyn. Compare Labour’s manifesto during his election to Bernie’s programme. Bernie’s looks extremely lukewarm in comparison.