Fucking no strike clause, what the FUCK
Liberals are fucking moronic scum, we have no freedom, we have no rights, we are granted no provisions for our betterment or even protection or basic decision making
I will destroy this evil land, I will spill the blood of oppressors and free my fellow workers from their chains
I AM RISEN 
no strike clauses for the duration of the contract is extremely super standard though? it's kinda like the one thing you have to give back to get a contract done
It's usually traded for no-lockout, closed shop and dues checkoff. If they don't get those,then it's an open shop where reps are spending all their time collecting dues and the employer can lay everyone off without just cause.
Sometime they negotiate contracts without it for the sake of a first contract, but it's rare, and tends to reduce membership rates.
There's a cool middle ground UE does sometimes where they get language about striking over grievances or safety issues.
IBT has another cool workaround where they can respect other unions' picket lines.