Question

in his attempt to eliminate radicals from american society, alexander palmer
defended civil liberties.
ignored civil liberties.
prevented the red scare.
caused the red scare.

Explanation:

Alexander Palmer led the Palmer Raids during the First Red Scare, targeting suspected radicals. These actions involved mass arrests, warrantless searches, and violations of due process, showing a disregard for civil liberties. The Red Scare was already underway due to post-WWI tensions, so he did not cause it; instead, he escalated it by ignoring civil liberties in his crackdown.

Answer:

ignored civil liberties.