[3] In the 2014 European Parliament election, Federley passed the previous MEP for the Center Party Kent Johansson, in personal votes, whom he thereby replaced.

[4] He left politics on 11 December 2020, after heavy criticism for having a relationship during 2020 with a man who was on parole for child rape.

[5][6] Federley was born in Munktorp in Köping Municipality, Västmanland County, but grew up in nearby Kungsör.

He later moved to Jakobsberg and to work as a political editor of the newspaper Norrtelje Tidning [fi; sv].

[7] Federley joined the Centre Party Youth during the 1994 election, and started a local branch of the organization together with a friend.

On 18 October 2002 Federley was unanimously elected new chairman of the Centre Party Youth, succeeding Malin Svensson [sv].

In addition to his committee assignments, Federley is a member of the European Parliament Intergroup on Integrity (Transparency, Anti-Corruption and Organized Crime).

[16] The sole opponent was Federley, however he claimed that attempts were made to prevent him from speaking against the proposal by the Centre Party.