Are proxy sites illegal?

Related questions

1. What is RPC server?
2. What does HTTP proxy mean?
3. Do I need a proxy with VPN?
4. What is MITM proxy?
5. What is proxy in WiFi?
6. Should I set proxy on or off?
7. Why do we use reverse proxy?
8. What does a Web proxy do?
9. What is proxy IP?
10. How does reverse proxy work?

Tags

1. #internet
2. #proxy
3. #doing
4. #preventing
5. #proxies
6. #currently
7. #legal
8. #states
9. #physically
10. #nothing
11. #website
12. #located
13. #could
14. #banned
15. #country
16. #outside
17. #united
18. #illegal