Carrying Out
Noun and する verb
しこう
せこう
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この法律の施行の責任を誰が負っていたのか覚えていますか？
Do you remember who is responsible for the enforcement of this law?
When you go to carry out something, you are carrying it out. That's why this is carry out (that is しこう). Alternatively, when you go carry out something, you are making sure something is getting done. You are doing enforcement on that thing that you're carrying out on.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Another alternative reading is せこう, which is more often used when talking about something law related.