My Poloniex account was hacked back in 2017 and 7 btc were stolen. I did not have 2FA at that time and the hacker got to my account and traded those coins away.
How did you make the conclusion that it was hacked? Because Poloniex assured you or some incident that let you to realized that it was hacked? I guess this is important.
My question is, can I take Poloniex to court? how can i get my funds back from US law enforcement given they have seized some funds.
You better need to talk to a lawyer who has experience of dealing cryptocurrency cases. A lawyer with no online experience will not understand your case.