Also known as run crew, stagehands, or backstage crew, these professionals work backstage during performances to keep the show running smoothly and safely. They are in charge of moving scenery, special effects such as trap doors or helping actors "fly," keeping track of props, and even operating lighting and sound systems. Most are employed on a per-show contract basis, but many midsize and large theatres use the same crew for nearly every production. Many stage crew members are part of the IATSE labor union (International Alliance of Theatrical Stage Employees), and you may need to join a union before seeking employment in this area. While many chose to get undergraduate degrees in technical theatre, these jobs do not usually require a degree beyond a high school diploma.