When people talk about constitutional rights like freedom of speech or religion, they often refer to them as guarantees. But no rights are absolute. Government has the power to limit individuals' freedom under certain circumstances, like when they've committed a crime.
For those worried that the congress is coming for their guns. The Bill of Rights is a series of Amendments to the Constitution and, therefore, is not subject to repeal by Congressional action.
Amendments: A constitutional amendment is a modification of the constitution of a polity, organization or other type of entity. Amendments are often interwoven into the relevant sections of an existing constitution, directly altering the text.