Onion grass clusters in my flower bed?

I noticed these bulb clusters last year in the fall all throughout my flower beds. They give off a slight onion smell when dug up. This spring they've sprouted having hollow leaves like chives in thick clusters. We also have a lot of tulips in the flower bed as well. What is this onion grass for? Is this a weed? Should I remove it from the garden?
  5 answers