A is a stalker who tortured Alison.A is an anonymous blackmailer who is aware
of the Liars' deepest and darkest secrets, and uses these secrets to exact
revenge on the Liars for alleged wrongdoings.
'A' was thought to be Part of the Black hoodies; the minions
of ‘A’ who did the dirty work for her. The Liars have seen Red Coat several times
and have discovered that 'Red Coat' is pulling the strings and the Black
Hoodies are indeed her minions. The Liars have still got to figure out who 'A' is.