Question

drag the missing word into place
the second red scare was a time marked by widespread
as people feared that communists were living amongst them.
paranoia
tactic
affiliation

Explanation:

The second Red Scare was characterized by people's fear of communists being among them, which led to widespread irrational fear or suspicion, i.e., paranoia. "Tactic" refers to a strategy, and "affiliation" refers to a connection, neither of which fit the context of widespread fear.

Answer:

paranoia