Lianna is a planet in the Outer Rim territories and is home to Sienar Technologies. It is also home to Sienar Fleet Systems which is one of the most important / prolific Imperial manufacters. Lianna supports the Empire though they did support the Republic during the Clone Wars.
They largely function as an independent world however so there isn’t a cadre of Stormtroopers patrolling the streets. However, they do support the Empire.