As someone else here stated, the term "Congress" in the constitution has been considered by the Supreme Court to include all of government. So for example, a public school cannot prevent the free exercise of religion, but also cannot mandate religious practice.
As someone else here stated, the term "Congress" in the constitution has been considered by the Supreme Court to include all of government. So for example, a public school cannot prevent the free exercise of religion, but also cannot mandate religious practice.
Read the 13th Amendment.