This is the 910th most frequent Latvian word.
iekšlietu
"Interior" or "internal affairs."
In this sentence, 'iekšlietu' is part of the proper noun 'Iekšlietu ministrija', which denotes the public institution related to domestic affairs or internal matters.
Latvijas Iekšlietu ministrija rūpējas par valsts drošību.
The Ministry of the Interior of Latvia takes care of the country's security.
Here, 'iekšlietu' is used as an adjective in the genitive case, modifying 'jautājumiem', indicating matters related to internal affairs.
Par iekšlietu jautājumiem atbild attiecīgā iestāde.
The corresponding institution is responsible for interior affairs matters.
In this usage, 'iekšlietu' again functions as an adjective, and in conjunction with 'nozares', it specifies the sectors related to internal or domestic issues.