Looks like Socialist Alternative is going to try to make DSA form a workers party by having some of it's members join DSA.
Current DSA by-laws allow for chapters to expel members for being in Democratic Centralist organizations but its not automatic. It also seems like SAlt isn't telling their members to join en-masse, just a few to push for a new workers party at meetings.
My DSA chapter isn't happy about this but it seems like most apprehension seems to be from their experience with individual SAlt members, first and the rudeness of the tactic, second. But there seems to be little consideration of their goals.
The only thing I can think of is the Militant tendency taking over the Liverpool branch of the Labour Party in the 1980s. They were pretty decent untill they all got expelled. But this literally the only thing I can think of.
SAlt used to be part of the same international organisation as the Militant Tendency in the UK (they've changed name since, I think they're called the SWP nowadays) but they recently split because the English chapter was calling all the shots for all the organisations, unfortunately, the English chapter also has all the money of the intere international..