Geodesic
A~group-theoretical property of the ramification filtration
Izvestiya. Mathematics , Tome 62 (1998) no. 6, pp. 1073-1094.

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Let $\Gamma(p)$ be the Galois group of the maximal $p$-extension of a complete discrete valuation field with a perfect residue field of characteristic $p>0$. If $v_0>-1$ and $\Gamma(p)^{(v_0)}$ is the ramification subgroup of $\Gamma(p)$ in the upper numbering, we prove that any closed non-open finitely generated subgroup of the quotient $\Gamma(p)/\Gamma(p)^{(v_0)}$ is a free pro-$p$-group. In particular, this quotient has no torsion and no non-trivial commuting elements. 
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V. A. Abrashkin. A~group-theoretical property of the ramification filtration. Izvestiya. Mathematics , Tome 62 (1998) no. 6, pp. 1073-1094. http://geodesic.mathdoc.fr/item/IM2_1998_62_6_a0/

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