Collocations for enforcement - noun

law
peace
soldiers involved in peace enforcement operations overseas

civil rights (AmE), drug (esp. AmE)
border, immigration (both AmE)
effective, proper
rigorous, strict, stringent, strong, vigorous
better, tighter, tougher
Newspapers called for tougher enforcement of the existing laws on drugs.

lax
selective (esp. AmE)
the selective enforcement of immigration laws

judicial, legal, police

agent, officer, official
personnel
agency, authority, body
federal law enforcement agencies
law enforcement bodies

machinery, mechanism, system
The court is ineffective because it lacks the necessary enforcement machinery.

powers
action, efforts, measures, methods, operations, practices, procedures, proceedings