Think unions, protests. Vietnam. Oil pipelines. 16 years after the first amendment, the government was all ready to trump up charges of coercion, violence, and conspiracy to destroy the first union in the USA. The whole thing about road and foot traffic is also about false charges. They're blocking a road with no traffic? Oh no they're blocking traffic!

"or the right of the people peaceably to assemble, except if it blocks traffic" - the USA Constitution