Immunities, conversely, are claim rights regarding the modification of first-order rights, e.g. U.S. citizens have, per their Constitution, certain immunities limiting the positive powers of the U.S. Congress to modify their legal rights.
Immunities, conversely, represent claims regarding the modification of fundamental rights, like those held by U.S. citizens under their Constitution, which restrict the ability of the U.S. Congress to alter their legal rights.