What is the truth about Sigma Nu

All the ranking posts have Sigma Nu solidly in the top ten but I see comments that make me wonder.
Here are some of the comments.....

DSP can't throw any party in house with alcohol without it being on the DL due to their nationals. It really holds them back, like it does SN, BTP, SPE and PDT.

SX and SN have been downhill for awhile due to the UNG issue and blanket bidding.

Pipe down ur (SNU) only not homeless cause another frats alumni had to bring yall back and yall house owned by ifc lol

I don’t even know if snu can throw at their house

best tailgates at uga

Can Sigma Nu throw parties at the house?
Can Sigma Nu have alcohol in the house?
What is the UNG issue?
Why/How is their house owned by IFC?
What other frat helped bring them back?
How can you have the best tailgates if you can't throw at the house?