There are many synonyms for the word "clampdowns," which means strict enforcement of rules or restrictions. One possible synonym is "tightening," which suggests that restrictions are being made even stricter than before. Another synonym is "crackdown," which indicates a forceful response to disobedience or noncompliance. "Suppression" is another synonym that suggests a more forceful approach to maintaining order. "Repression" is another word that suggests a heavy-handed approach to controlling behavior. Other potential synonyms for "clampdowns" might include "curtailment," "limitation," or "restriction," all of which suggest an effort to limit or control certain behavior or activity to maintain order and safety.