What is ezic gift?

I just got a gift of a thousand credits in the game, which is listed as EZIC GIFT in the end of day screen. The ability to uncheck it seems to indicate that something negative will come out of it.

What is it and what are its effects?

EZIC, referred to as the Order of the Ezic Star, is a mysterious organization in Papers, Please. The player first encounters EZIC when a random immigrant hands a business card over to the player. Seeing as the card only appears on the last level of the Beta, EZIC isn't mentioned again. However, on the back of the card, an immigrant's name is shown. The player must give the card to that person who will then say "If you help us, we will help you".

After a few days, The EZIC will give you 1000 credits with the option to burn it.

Source

Effects on keeping the money

If the money is kept, later in the game your neighbors will report you to the government and you will lose the money.

Effects on burning the money

If the money is burned, they will offer you 2000 the next day. (This money works like the first 1000 and has same choices and effects.) If you burn the money this time as well, the game will continue normally, with no extra consequences.