Anyone facing issues with re-entry into USA with a GC

I am about to leave USA for 3 months and I have been a GC holder for the last 3 years. I have worked for only 1 of the 3 years. Politically I am center left (not an activist) but I have made political contributions to the Dems while on GC and I was wondering if I will face any issues while re-entering the country. I was wondering if on re-entry if the CBP can use any hidden violation that I am not aware of right now to prevent my re-entry. The only thing I can remember as coming close it that in 2016 I mistakenly made a political contribution to presidential campaign unaware that without a GC I was not allowed to do that. When I realized my error I called up the political campaign number and asked for a reimbursement. Can small issues like this lead to any problem? Should I contact an immigraton attorney just for safety or am I being paranoid?
 
They can't just "prevent your re-entry". If they think you are inadmissible for any reason (I don't see any such reason), and you don't voluntarily sign to give up your green card, they have to refer you to removal proceedings in immigration court, before an immigration judge. If that happens, you can contact an attorney then.
 
Though from what I understand they can't detain you unless you have a criminal conviction or immigration violation and if you have not received any kind of court or immigration notice you are safe. Most GC holders who have been detained have had criminal convictions in the past.
 
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