Following the OT laws about not eating pork, or not shaving, or circumcision, or not eating crustaceans, or keeping the Sabbath, aren't these all fundamentalist concepts?
If not, how are people defining "fundamentalism"?
Because people are defining the word as it currently stands. Within Judaism, fundamentalism, now, is the act of taking the basics to the extreme. such as:
men walking on one side of the street while women walk on the other;
since men can be turned on by the undergarments of a woman, a woman must wear a veil that covers her from head to foot so as not to show even the pinkie finger, lest a man get sexually aroused(doesn't make sense to me either);
sending children to "councilors" because they question Torah or G-d or the Rebbe's edicts;
Rebbe's making silly edicts about what one can read, listen to, or watch;
throwing stones at others that don't believe in Torah the same way you do;
setting people on fire because they refuse to attend your synagogue or they disagree with your rebbe.