When 라 comes after a verb, it makes an imperaive sentence. And it may sounds like a command. 가라 meanGO!!!
Other examples: 먹어라 means EAT!!! 보라 means LOOK!!! 읽어라 means READ!!!
Also, verb+주세요 makes imperative sentence, but this sounds more soft and smooth.
I hope my answer can be helpful for you. ^-^