"Ultra" is a word in LAW AND LEGAL, ENGLISH

Lat Beyond; outside of; in excess of

A prefix from the Latin ultra beyond (see Ulterior), having
in composition the signification beyond, on the other side, chiefly
when joined with words expressing relations of place; as, ultramarine,
ultramontane, ultramundane, ultratropical, etc. In other relations it
has the sense of excessively, exceedingly, beyond what is common,
natural, right, or proper; as, ultraconservative; ultrademocratic,
ultradespotic, ultraliberal, ultraradical, etc.

Going beyond others, or beyond due limit; extreme;
fanatical; uncompromising; as, an ultra reformer; ultra measures.

One who advocates extreme measures; an ultraist; an
extremist; a radical.