>>bigyab+ub2
https://duckduckgo.com/?q=obstruction+of+police+officer+usa gives many results that clearly demonstrate that willfully impeding federal LEO (including physically, as in this case) is a federal crime.

https://duckduckgo.com/?q=can+protesters+block+traffic+usa similarly establishes that blocking traffic is not lawful and does not become lawful simply because of free speech protections on protest.