Syndicate

In Syndicate, you lead a large-scale police sting operation in 1930s Chicago to infiltrate the mafia. You must slowly gain the trust of the mafiosos, bringing your team of undercover agents slowly up the ranks. Promotion is difficult, as you may only bring in people that have enough rapport and trust with the other existing members of the same rank. Once you’ve promoted one agent above the highest level, you can take down the whole operation in one swoop.

As part of the Isaludo collection, the rules can be found in this forum thread.