Oh, I got this one. So for Volkov, you just need to exchange your dirty bills for clean ones until he runs out of money. You're going to need a lot, so pull some heists involving the armored car or do the funny papers. I would estimate something along the lines of 150K in dirty. Also, you'll need to do this in the outskirts FIRST. Afterwards, you can lewd him in your club by following the same steps. As for the Mafia boss, you'll need to lose all your crowns in Blackjack. Then, he'll offer a loan which you MUST lose to get the scene. As for arming your gang, that's actually one of the daily events. Just have a case of weapons on standby, else your gang takes a -1 hit to morale until you get it sorted.