Answer: hire; hire
Explanation:
The Nash equilibrium for this game is for Management to hire a lawyer, and for Labor to hire a lawyer.
At the Nash Equilibrium, there is no incentive for either player to deviate from the strategy they are pursuing as it is the best(most beneficial) one given the strategy of the other player and a situation where there is no cooperation.
If management decides not to hire a lawyer and labor does, management will lose 0.9 of the time, this applies to labor as well. Neither of them will agree to having no lawyer as there is no cooperation and if one does so, the other will seize the opportunity to hire a lawyer and make more.