What proof is required to satisfy RICO and VICAR's interstate-commerce elements, and, more specifically, must prosecutors prove that an enterprise's activities in fact affected interstate commerce or is it sufficient to prove that enterprise members engaged in a category of activity deemed to affect interstate commerce in the aggregate?

What proof is required to satisfy RICO and VICAR's interstate-commerce elements, and must prosecutors prove that an enterprise's activities in fact affected interstate commerce or is it sufficient to prove that enterprise members engaged in a category of activity deemed to affect interstate commerce in the aggregate?