Early in tournament with 150 bbs same as villian. Loose villian opened 3x utg. One call from another and hero reraise 3x. Villian 3 bet 3x and hero 4 bet with 2/3 of stack. Villian shove and hero called. Villian shows AK off. Hero has QQ. Would you have risked it in early stages of tournament?

So you are the one who 3bets. Your 3bet sizing is too small, go 4 times. WP UL

Yes

Yes as in QQ should have folded?

No I meant it's standard to gii in this spot.

rebuy

Theres no point 5 betting 2/3 of your stack. You leverage yourself as you're never folding so you just allow vill to decide if the rest of the money should go in.

I'd likely flat the 4 bet.

Once you 4 bet there is no decision.

But I remember a thread similar to this a while ago. Basically it was a scenario in a 10K buy-in where SB shoved 100BB preflop with AK (weaker player) and BB looks down at QQ. SB exposed his cards so only BB could see. Should BB take the slight edge here or wait for a better spot?

There were a few things that people mentioned as some of the main points.
1. It's an advantage to have a big stack early on. A good player can use the big stack effectively to get even more chips. Gamble early on for a big stack.
2. Variance, do we want to take a high variance spot or look for a better spot. Depending on the buy-in and bankroll considerations.
3. Is it easy to buy back in and is there another game to jump into? For a low buy-in rebuy or re-entry tournament we would most likely take the gamble. Is this was the WSOP ME, we will probably fold.

OK, so trying to get your post clear, this was the action preflop:

UTG raise to 3BBs, MP calls 3 BBs, Hero raises to 9BBs, UTG raises to 27BBs, MP folds, Heros raises to 100BBs, UTG raises all in to 150BBs, Hero calls.

Is this accurate?

To basically supplement what Phatpots said:

If you're in a low-variance tourney with long levels and a large starting stack, and you have a clear skill edge over the competition post-flop, then you generally shouldn't be risking your life to flips this early.

If you're in a high-variance, 20 minute level tourney, with short levels and you're still in the early levels and rebuys are available, and having a large stack is important with how quickly and high the blinds move, then it's probably worth a flip this early.

Reading the action, though, YOU 3b, not V. V opened and there was an overcall in between and then you raised. That's the 3b. When it gets back to V he 4-bets and then you 5b 2/3 your stack which, as mentioned, is really awkward. Both your 3b and your 5b were both too small. 3b a bit larger and in general you should never make a bet that's more than 50-60% of your stack that isn't all-in.

Yes that's pretty much accurate.

Speaking as a cash game specialist who plays tournaments infrequently, I would not have risked it early in a tournament and would possibly even just call the open instead of 3betting, but I think this is player-dependent and some people will say yes and some people will say no and it might be the right decision for them.