Masonry jobs involve using brick, stones, and cement blocks to build structures. In a union masonry position, you work as part of a labor union, which is an organization that negotiates wages and contracts and works to protect the rights of its members. As a mason, you work on construction projects involving brick or stone. In addition to positioning bricks and securing them with mortar, your duties include planning the layout of a structure, building frames, and ensuring a safe work environment. Your responsibilities may also include tearing down or repairing existing brick or stone elements or structures.