For a great review of why mandatory vaccinations are unconstitutional and illegal, I recommend the book “Horrors of Vaccination Exposed and Illustrated; Petition to the President to Abolish Compulsory Vaccination in the Army and Navy,” by Charles M. Higgins.
Written in 1920, the book is now in the public domain and can be read and downloaded for free by clicking this link . It discusses the dangers of vaccinations, the cover-ups of vaccine deaths, and explains your constitutional rights and the medical trends that are stripping those rights away, and is every bit as relevant today as it was when it was first written.