No, Obama did not remove 500,000 pedophiles from a background check database | Fact check
A May 1 Instagram post (direct link, archive link) shows a screenshot of a 2018 news article with the headline "Obama Removed 500,000 Pedophiles From Background Check Database."
The article's subhead reads, "Barack Obama ordered the FBI to remove over 500,000 names of potential murderers and pedophiles from the National Instant Criminal Background Check System, acting FBI director David Bowdich testified Wednesday."
The post generated over 100 likes in less than a week. Similar posts have spread widely on Instagram.