With large companies it is difficult to determine whether their profits support the alt-right but fortunately we do have activists tracking and scraping data on campaign donations that help build boycott lists. No privately offered product or service is so important to me that I will sell my soul to the alt-right to get it. But how do we avoid it unwittingly? This is a tough question.
Here is the approach I take: I tend to support companies who actively support the LGBTQ community. Why? Because if they support the LGBTQ community they likely support human rights overall.
Evidence of this can be found in the Equality Index maintained by the Human Rights Campaign. It can be used to quickly look up a company's equality index to see how they treat their employees.
Another way is to look up whether these companies actively support Gay Pride events that cost them money. At many companies, support for pride parades and festivals is being fueled by internal Lesbian, Gay, Bisexual and Transgender councils who are given small budgets and freedom to spend that money where they choose.
Finally, there are apps designed to help guide buying and everyday shopping for the mobile device users:
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