Given the fact that this play is said to be an allegorical account of the McCarthyism Era, how has the plot thus far in the play begun to reflect those events?

In act one, we can already see fear and speculation building within the community. Abigail and Tituba have figured out how to deflect suspicion: they simply accuses someone of something bad. This sets off a chain reaction of accusations against community members. The hysteria becomes a witch hunt where there are no witches. This same can be said for the paranoia surrounding the McCarthyism Era.