The 501st Legion, also known as the 501st Battalion during the Clone Wars and later known as "Vader's Fist" and the Five Hundred and First, was an elite unit of clone troopers commissioned by Supreme Chancellor Palpatine during the Clone Wars that later became a stormtrooper unit. Made up of units like Torrent Company, the 501st fought in many battles, such as the Battle of Teth and the Battle of Coruscant, becoming one of the most well-known legions. In 19 BBY, the 501st became Darth Vader's personal unit as he led them during Operation: Knightfall, in which the clones helped take down the Jedi, whom they believed to be traitors to the Republic.
Greetings, fellow Imperial citizens! This is Emperor Palpatine, speaking to you via Coruscant HoloNet. The War against the Rebellion is going quite well, and I'm working on a plan to find their base. Grand Moff Tarkin has assured me that the Death Star is indestructible, and I'll be sending it towards Alderaan for a brief tour of duty. Well, that's all for now. Keep your kids healthy, report on any Jedi you see, and remember, serve the Empire with pleasure!
@Bail Organa: Yo dude. Head over to Alderaan, so we can talk by HoloNet. I have a little...surprise...waiting for you.
@Lord Vader: I know about the Half-Twilek kid. Get 'em out of your apartment before I send my agents to find out who the mom is. That wouldn't be so great for your reputation, eh?
*Insert epic Mandalorian comment here.*
@Red Squadron: we have proton torpedoes with Tarkins Name on it if Alderaan Go's boom boom
Umm you see the kid is not mine it was...