British Boy Band One Direction -- Massive Security Detail for Dallas Show

There are five members in the hit British boy band One Direction -- and today in Dallas, there will be 20 security personnel for each of them ... to ensure their rabid fan base stays safe and in check.

According to our sources, a security team of 100 has been assigned to protect the group for their performance ... which is only supposed to last 45 minutes.

The band, which became the first UK group in history to debut at number one with their first album, is scheduled to play just four songs for a crowd of about 7,000 at the Dr Pepper Ballpark.

The security breaks down like this: 40 for close protection security, 50 more for the venue, and then 10 more just on stand by.