No. This would severely cheapen team gameplay in a lot of ways. If you're still CT1 and want to be part of a different party, just ask. I can alter your party, but players never will be able to.
You can already do this by passing the congressional security/martial law bills. While in effect, they offer protection of 1 and 3 levels, respectively, to everyone in the game. If you mean something on a personal level, nothing is currently implemented as I don't want cash to be too powerful. I may add something in the future, but it may also be scandalous (bribing the police or somesuch).
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No. This would severely cheapen team gameplay in a lot of ways. If you're still CT1 and want to be part of a different party, just ask. I can alter your party, but players never will be able to.