Hold up, there's a problem here.

A "gang" is not where some folks get together and decide to have a club together with a hang out. A gang is a club where they practice criminal enterprise as an organization.

There are plenty of "legal" gangs in America. They're called clubs. Country club, MOPAR Club, Gun club, etc. Even motorcycle clubs are perfectly, absolutely legal. Hell, technically they're 501.3cs. Most organized clubs are non-profits. Even the small ones (like 10 or so people). What makes a difference between a VFW MC and the Mongrels is one rides around, drinks and does scholarship rallies for disadvantage yutes. The other rides around, drinks and sells heroin. One doesn't do illegal things. The other does illegal things. One gets considered a club still while the other... say it with me class... becomes a gang because they do illegal shit.

Hell, the Polish-American club or Mopar club I'm with can very, very easily become a gang. All we have to do is start running guns or drugs. Maybe some prostitution. A little racketeering. Holy shit, we're a gang now. How is that? I don't understand? Oh wait, it's because we did something illegal as an organization! Actually, the Polish-American club can become a gang pretty easy. Just smuggle a bunch of Kinder Eggs into the country (for those that don't know, real Kinder Eggs are illegal to import into the US... and they're delicious & fun...even as an adult). That's all we need would need to do to be labeled a gang. Why? Because we did illegal shit as an organization. That's why there are RICO laws too. Mostly to take the head off the snake of said organizations though.

You want to start a club, then buy some abandoned building, fix it up, have a place for all of y'all to hang out. Then as a club y'all decide to do a bake sale of cakes, cookies or even start a car repair shop to raise funds for the club. Y'all do well and decide "Hey, let's have a concert for everyone in town to enjoy. You know what, we need a new skate park for the yutes. Let's build a skate park for the yutes." No one can legally stop you or shut down your club currently in the USA. That is roughly the story of one group here locally to me. The moment you decide, "Let's sell meth to build a skate park." That's where it becomes a "gang". Or you killed the old guy who owned the abandoned building and put a gun to his wife's head to sign it over to the club. That's pretty illegal too.

TLDR: no difference between a club and a gang, except one does illegal shit and the other has cookie bake sales. Make a club. Join a club. Who cares. No one does... except the queen of england. You can't have secret clubs in england if I remember right. But on the freedom side of the pond, you can't do illegal shit as part of your club. Bake some fucking bread and sell it as a way to fund your club. No one cares. Except the IRS. Makes sure to declare that shit. Just don't bake meth. Hold car shows. Don't do drive by shootings. Rescue women from abusive relationships. Don't do prostitution. Start a low cost building repair services for homes and businesses in the area. Don't do extortion. I'm trying to figure out how this is so fucking difficult to understand. Read an actual law book. They're free at your local library. Stop being stupid. Yes, gangs should be illegal. For very good fucking reason. Clubs are not illegal in the USA.