Two Finnish men allegedly filmed themselves giving the salute at the camp.
The government recently allocated 3 million zloty, some €660,000, to the “Patriotic Fund” which will distribute money to three highly problematic groups.
The move, which critics say wrongly conflates pedophilia with LGBT issues, triggered a mass rally outside parliament on Monday, while several rights groups have called on Fidesz to withdraw the bill.
The 24-year-old made comments on social media where he sympathized with Nazis, described Jews as "parasites" and said that "extermination is the best option for them."
Wray said some US far-right extremists had traveled to Europe to meet and possibly train with activists.
State media said a famous actor, Zin Wine, and singer Po Po, both known for their support of the democracy movement, had also been arrested.
The march was allegedly organized by white supremacists through Telegram, a popular social media and encrypted messaging application.
"No one wants to be the last state standing without a hate crime law," said Swati Patel, interim CEO of the South Carolina Chamber of Commerce.
As the forum got underway, police entered the building and began detaining attendees and taking them to police vans waiting outside, video footage from TV Rain and Russian news agencies showed.