In Unity There Is Strength(a group of people with same goals can accomplish more than individuals can)
If we want better working conditions, we've got to get together and make up a list of grievances to present to the administration.
But what makes you think they'll listen to us?
In unity there is strength! We won't get anywhere by complaining individually. We can accomplish more as a group than we can by ourselves.
That makes sense. Let's call a meeting of all the employees of the shop. We can pin down our demands and present a united front. Maybe we'll get someplace this time.
grievance = 苦情、不満
present to the administration = 経営側に提示する
pin down = はっきりさせる
present a united front = 共同戦線を張る
get someplace = get somewhere