There are a few specific examples given in Sikh History (Sakhis). Such as Moola Khatri.
But you should also know that it was (I believe) Sant Bhindrawale who said that while it may be the case that a specific action will lead to a specific reincarnation, it is not our place to make assumptions the other way: I.e., look at someone who is poor or whatever and assert that they did something specifically bad in the previous life.
That's God's domain.
All we need to be concerned with is to live life as Guru ji told us and we'll get the reward of that.