Testimony at Georgia hearing of Data Integrity Group showing votes being removed or switched in the voting data. It is just 18 minutes and gives an overview of what a group of both Republican and Democrat data scientists found.
They state that no one has refuted any of this today but if you know of anywhere this analysis has been refuted please post in comments.
Longer explanation of the group, their purpose and their process, 50 minutes.
The Fact Finding Expedition 