Kai Henning Bothildsen Nielsen (4 December 1919 – 9 May 1947) was a Danish national socialist who became a member of the Peter group in Denmark during the Second World War.

[2][3] In 1938 Bothildsen joined the Danish National Socialist Workers' Party of Denmark and their Sturmabteilung.

He opted to stay in Germany where he opened a paint shop which he ran until June 1943 when he was enrolled in Schalburgkorpset.

In Schalburgkorpset he was assigned the Intelligence wing which had a special status as an autonomous unit increasingly used by the Germans to carry out various jobs.

He was assigned the codename Perle (English: Pearl) and under that name he participated in a large number of actions aimed at punishing civilians.