Noun and する verb
せいこう
賃金カットなんかしたら、製鋼所の工員達がストライキを起こすかもしれませんよ。
If you cut their wages, the steelworkers might go on strike.
If you manufacture steel that is steel manufacture.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.