This is the 8707th most frequent Korean word.
가해진
"Applied" or "inflicted."
The word '가해진' is used here to describe an action ('applied') that was exerted onto the subject's shoulder.
그의 어깨에 가해진 압력이 매우 컸다.
The pressure applied to his shoulder was very strong.
In this sentence, '가해진' is used figuratively to mean that the decision faced or was subjected to substantial controversy.
그 결정에는 많은 논란이 가해진 것으로 알려졌다.
It is known that much controversy was applied to that decision.
Here, '가해진' specifies the area (front-left part) of the car that received or was subjected to impact.