Remember that the Hyundai workers in Georgia were deported at the best of the local union. Right now, foreigners are a large portion of this field's workforce. If you are to join with a union, you will rapidly find that it absorbs the remainder of the workforce through being "a union shop". You will rapidly find that such a union will expand to include all these people. And then they will ask for you to be deported. It wouldn't be the first time. The reason Chinese and Indians couldn't be citizens for a long time is because the predecessor to today's AFL-CIO lobbied to block that.
Choose wisely. The danger is looking you right in the face and saying "I am the danger".