Play wrights were restricted by the queens men censorship. They stopped playwrights from writing about any subject that even mentioned rebellion or Catholicism. Especially punished was regicide, Many playwrights were killed for past works they had written which involved killing the king or queen.
Shakespeare was almost jailed when he named one of his characters after sir john oldcastle in his play Henry the 4th part one. He made sir oldcastle appear to be a drunk and a braggart. In real life he was a rebel against king Henry the 5th. He was executed and the new Protestant rule made him into a martyr. The new lord chamberlain was a descendent of oldcastle and was not a fan of the theatre at the best of times.(http://www.pbs.org/shakespeare/events/event91.html 24/9/13 unknown author

How they displayed violence on stage
The Elizabethans had many different ways of mimicking violence on stage. One way was to have the actor on a turntable, when the “attacker” moves towards the victim the audience cannot see the victim. The turntable is then used to replace the actor with a dummy covered in animal blood. They also use parts of animal organs such as intestines and brains to demonstrate the violence. Animal bones could be broken to make the desired sound and animal bladders filled with blood and concealed under a actors clothes could be split with the point of a dagger or sword to make it appear as of the actor has been stabbed.
http://www.bardstage.org/globe-theatre-special-effects.htm accessed 24/9/13 unknown author