I am aware of a single instance of national leadership facing an assault accusation in 2017. While the process took longer than it should, the NPC member was removed, and DSA bylaws were changed at the following convention to make the process easier if it ever happened again. In single chapters the only one I’m aware of is Lawrence KA DSA, which was also resolved fairly quickl (by the chapter I think disbanding, not sure), and frankly also had a lot of other intra-chapter sectarian fighting stuff going on (including one member who had quit, joined PSL, and then been so obscene that they were kicked out of PSL, and some kansas city redguard chicanery).

Compare this to the ISO where the entire national leadership covered up an assault.