Simple, the Federation and Klingons had a peace accord that removed the neutral zone, and allowed for people like Worf to serve in Starfleet. Although the allies thing is a very shaky thing to argue, simply because while they weren't enemies and were free to travel through Federation space, the Klingons were treated, even before "Sins of the Father" to be uneasy allies with the Federation. Yes the Klingons saw them as more honorable than the Cardassians or Romulans, but they still were at odds with their cultures. It wasn't like the Vulcans, and their devotion to intergalactic peace, making their values were completely compatable for the Federation (which is why they were members)

I know the show tried to established a consistent narrative about that, but even before "Samaritan Snare" when Picard says they became allies, there were several episodes that show them more as frenemies rather than downright friends and allies (although being an ally is not the same as joining the Federation) like the Vulcans were. The first one was "Heart of Glory", although it was limited to some rogue members of the Klingons who wanted to harm the Enterprise, and manipulate Worf into joining them again. And the Klingon ship that offered to punish the Klingon intruders, had a Federation logo on it that would suggest they joined the Federation.
But "A Matter of Honor" (which came in 1988, before "Samaritan Snare" did [1989, immediately the next episode after "Q Who") is what really set the stage as to what they wanted to do with the Klingons. It was supposed to be a cultural exchange, but the Klingons were downright frenemies to the Federation in this episode. And you can argue that it was just Klingons being Klingons, and it wasn't personal, and they were just trying to roughen Riker up, but the subordinate that tries to strike Riker also seemed to hate him. Then one scene has them as almost starting a fight with the D, and Riker trying to convince them that they're doing nothing wrong, of course, it could be it was a test to see if Riker would have the balls to challenge the head captain, but still it sort of made them seem like frenemies). The one thing that makes the frenemies is the way they ruthlessly mock Riker for his human sensibilities during the dining scene. And say they could give him something easy, with the Klingon women breastfeeding him (it's sort of a form of the "child's uniform" insults).
Then "Sins of the Father" was the big one that really made them more like frenemies.

Klingons are allies with Starfleet, that's why

Well ships dock in a wharf, so Starfleet seemed the obvious choice.

<< groan >>

What are the clegnuts, bini !?

What is a cling on , buna?
Slang for clegnuts stuck on ur bum, buna

something you lick up Tuna
Beep Boop Beep!

What is a cling on , buna?

raised by humins buna, the cling ons are alian too him

I thought it was Mr Wart because him have something attache to the head, hana

I thought his name was Dwarf.
Ho Ho Ho

no one
My password is password

Who is Wharf, buna?